diff --git a/lib/src/model/literal.rs b/lib/src/model/literal.rs
index 5d340a27..ab5bcdb3 100644
--- a/lib/src/model/literal.rs
+++ b/lib/src/model/literal.rs
@@ -268,11 +268,11 @@ impl From<Decimal> for Literal {
     }
 }
 
-impl From<Date> for Literal {
-    fn from(value: Date) -> Self {
+impl From<DateTime> for Literal {
+    fn from(value: DateTime) -> Self {
         Literal(LiteralContent::TypedLiteral {
             value: value.to_string(),
-            datatype: xsd::DATE.into(),
+            datatype: xsd::DATE_TIME.into(),
         })
     }
 }
@@ -286,11 +286,56 @@ impl From<Time> for Literal {
     }
 }
 
-impl From<DateTime> for Literal {
-    fn from(value: DateTime) -> Self {
+impl From<Date> for Literal {
+    fn from(value: Date) -> Self {
         Literal(LiteralContent::TypedLiteral {
             value: value.to_string(),
-            datatype: xsd::DATE_TIME.into(),
+            datatype: xsd::DATE.into(),
+        })
+    }
+}
+
+impl From<GYearMonth> for Literal {
+    fn from(value: GYearMonth) -> Self {
+        Literal(LiteralContent::TypedLiteral {
+            value: value.to_string(),
+            datatype: xsd::G_YEAR_MONTH.into(),
+        })
+    }
+}
+
+impl From<GYear> for Literal {
+    fn from(value: GYear) -> Self {
+        Literal(LiteralContent::TypedLiteral {
+            value: value.to_string(),
+            datatype: xsd::G_YEAR.into(),
+        })
+    }
+}
+
+impl From<GMonthDay> for Literal {
+    fn from(value: GMonthDay) -> Self {
+        Literal(LiteralContent::TypedLiteral {
+            value: value.to_string(),
+            datatype: xsd::G_MONTH_DAY.into(),
+        })
+    }
+}
+
+impl From<GMonth> for Literal {
+    fn from(value: GMonth) -> Self {
+        Literal(LiteralContent::TypedLiteral {
+            value: value.to_string(),
+            datatype: xsd::G_MONTH.into(),
+        })
+    }
+}
+
+impl From<GDay> for Literal {
+    fn from(value: GDay) -> Self {
+        Literal(LiteralContent::TypedLiteral {
+            value: value.to_string(),
+            datatype: xsd::G_DAY.into(),
         })
     }
 }
@@ -312,6 +357,7 @@ impl From<YearMonthDuration> for Literal {
         })
     }
 }
+
 impl From<DayTimeDuration> for Literal {
     fn from(value: DayTimeDuration) -> Self {
         Literal(LiteralContent::TypedLiteral {
diff --git a/lib/src/model/xsd/date_time.rs b/lib/src/model/xsd/date_time.rs
index 5b3ab922..df1e7b61 100644
--- a/lib/src/model/xsd/date_time.rs
+++ b/lib/src/model/xsd/date_time.rs
@@ -1,5 +1,9 @@
 use super::parser::{date_lexical_rep, date_time_lexical_rep, parse_value, time_lexical_rep};
 use super::{DayTimeDuration, Decimal, Duration, XsdParseError, YearMonthDuration};
+use crate::model::xsd::parser::{
+    g_day_lexical_rep, g_month_day_lexical_rep, g_month_lexical_rep, g_year_lexical_rep,
+    g_year_month_lexical_rep,
+};
 use std::cmp::{min, Ordering};
 use std::convert::{TryFrom, TryInto};
 use std::error::Error;
@@ -166,6 +170,10 @@ impl DateTime {
             })
         }
     }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
 }
 
 /// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
@@ -327,6 +335,10 @@ impl Time {
         .try_into()
         .ok()
     }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
 }
 
 /// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
@@ -475,6 +487,10 @@ impl Date {
             .try_into()
             .ok()
     }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
 }
 
 /// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
@@ -513,6 +529,499 @@ impl fmt::Display for Date {
     }
 }
 
+/// [XML Schema `gYearMonth` datatype](https://www.w3.org/TR/xmlschema11-2/#gYearMonth) implementation.
+#[derive(Eq, PartialEq, PartialOrd, Debug, Clone, Copy, Hash)]
+pub struct GYearMonth {
+    timestamp: Timestamp,
+}
+
+impl GYearMonth {
+    pub(super) fn new(
+        year: i64,
+        month: u8,
+        timezone_offset: Option<TimezoneOffset>,
+    ) -> Result<Self, DateTimeError> {
+        Ok(Self {
+            timestamp: Timestamp::new(&DateTimeSevenPropertyModel {
+                year: Some(year),
+                month: Some(month),
+                day: None,
+                hour: None,
+                minute: None,
+                second: None,
+                timezone_offset,
+            })?,
+        })
+    }
+
+    pub fn from_be_bytes(bytes: [u8; 18]) -> Self {
+        Self {
+            timestamp: Timestamp::from_be_bytes(bytes),
+        }
+    }
+
+    pub fn year(&self) -> i64 {
+        self.timestamp.year()
+    }
+
+    pub fn month(&self) -> u8 {
+        self.timestamp.month()
+    }
+
+    pub fn timezone(&self) -> Option<DayTimeDuration> {
+        Some(self.timezone_offset()?.into())
+    }
+
+    pub fn timezone_offset(&self) -> Option<TimezoneOffset> {
+        self.timestamp.timezone_offset()
+    }
+
+    pub fn to_be_bytes(&self) -> [u8; 18] {
+        self.timestamp.to_be_bytes()
+    }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<DateTime> for GYearMonth {
+    type Error = DateTimeError;
+
+    fn try_from(date_time: DateTime) -> Result<Self, DateTimeError> {
+        GYearMonth::new(
+            date_time.year(),
+            date_time.month(),
+            date_time.timezone_offset(),
+        )
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<Date> for GYearMonth {
+    type Error = DateTimeError;
+
+    fn try_from(date: Date) -> Result<Self, DateTimeError> {
+        GYearMonth::new(date.year(), date.month(), date.timezone_offset())
+    }
+}
+
+impl FromStr for GYearMonth {
+    type Err = XsdParseError;
+
+    fn from_str(input: &str) -> Result<Self, XsdParseError> {
+        parse_value(g_year_month_lexical_rep, input)
+    }
+}
+
+impl fmt::Display for GYearMonth {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let year = self.year();
+        if year < 0 {
+            write!(f, "-")?;
+        }
+        write!(f, "{:04}-{:02}", year.abs(), self.month())?;
+        if let Some(timezone_offset) = self.timezone_offset() {
+            write!(f, "{}", timezone_offset)?;
+        }
+        Ok(())
+    }
+}
+
+/// [XML Schema `gYear` datatype](https://www.w3.org/TR/xmlschema11-2/#gYear) implementation.
+#[derive(Eq, PartialEq, PartialOrd, Debug, Clone, Copy, Hash)]
+pub struct GYear {
+    timestamp: Timestamp,
+}
+
+impl GYear {
+    pub(super) fn new(
+        year: i64,
+        timezone_offset: Option<TimezoneOffset>,
+    ) -> Result<Self, DateTimeError> {
+        Ok(Self {
+            timestamp: Timestamp::new(&DateTimeSevenPropertyModel {
+                year: Some(year),
+                month: None,
+                day: None,
+                hour: None,
+                minute: None,
+                second: None,
+                timezone_offset,
+            })?,
+        })
+    }
+
+    pub fn from_be_bytes(bytes: [u8; 18]) -> Self {
+        Self {
+            timestamp: Timestamp::from_be_bytes(bytes),
+        }
+    }
+
+    pub fn year(&self) -> i64 {
+        self.timestamp.year()
+    }
+
+    pub fn timezone(&self) -> Option<DayTimeDuration> {
+        Some(self.timezone_offset()?.into())
+    }
+
+    pub fn timezone_offset(&self) -> Option<TimezoneOffset> {
+        self.timestamp.timezone_offset()
+    }
+
+    pub fn to_be_bytes(&self) -> [u8; 18] {
+        self.timestamp.to_be_bytes()
+    }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<DateTime> for GYear {
+    type Error = DateTimeError;
+
+    fn try_from(date_time: DateTime) -> Result<Self, DateTimeError> {
+        GYear::new(date_time.year(), date_time.timezone_offset())
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<Date> for GYear {
+    type Error = DateTimeError;
+
+    fn try_from(date: Date) -> Result<Self, DateTimeError> {
+        GYear::new(date.year(), date.timezone_offset())
+    }
+}
+
+impl TryFrom<GYearMonth> for GYear {
+    type Error = DateTimeError;
+
+    fn try_from(year_month: GYearMonth) -> Result<Self, DateTimeError> {
+        GYear::new(year_month.year(), year_month.timezone_offset())
+    }
+}
+
+impl FromStr for GYear {
+    type Err = XsdParseError;
+
+    fn from_str(input: &str) -> Result<Self, XsdParseError> {
+        parse_value(g_year_lexical_rep, input)
+    }
+}
+
+impl fmt::Display for GYear {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let year = self.year();
+        if year < 0 {
+            write!(f, "-")?;
+        }
+        write!(f, "{:04}", year.abs())?;
+        if let Some(timezone_offset) = self.timezone_offset() {
+            write!(f, "{}", timezone_offset)?;
+        }
+        Ok(())
+    }
+}
+
+/// [XML Schema `gMonthDay` datatype](https://www.w3.org/TR/xmlschema11-2/#gMonthDay) implementation.
+#[derive(Eq, PartialEq, PartialOrd, Debug, Clone, Copy, Hash)]
+pub struct GMonthDay {
+    timestamp: Timestamp,
+}
+
+impl GMonthDay {
+    pub(super) fn new(
+        month: u8,
+        day: u8,
+        timezone_offset: Option<TimezoneOffset>,
+    ) -> Result<Self, DateTimeError> {
+        Ok(Self {
+            timestamp: Timestamp::new(&DateTimeSevenPropertyModel {
+                year: None,
+                month: Some(month),
+                day: Some(day),
+                hour: None,
+                minute: None,
+                second: None,
+                timezone_offset,
+            })?,
+        })
+    }
+
+    pub fn from_be_bytes(bytes: [u8; 18]) -> Self {
+        Self {
+            timestamp: Timestamp::from_be_bytes(bytes),
+        }
+    }
+
+    pub fn month(&self) -> u8 {
+        self.timestamp.month()
+    }
+
+    pub fn day(&self) -> u8 {
+        self.timestamp.day()
+    }
+
+    pub fn timezone(&self) -> Option<DayTimeDuration> {
+        Some(self.timezone_offset()?.into())
+    }
+
+    pub fn timezone_offset(&self) -> Option<TimezoneOffset> {
+        self.timestamp.timezone_offset()
+    }
+
+    pub fn to_be_bytes(&self) -> [u8; 18] {
+        self.timestamp.to_be_bytes()
+    }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<DateTime> for GMonthDay {
+    type Error = DateTimeError;
+
+    fn try_from(date_time: DateTime) -> Result<Self, DateTimeError> {
+        GMonthDay::new(
+            date_time.month(),
+            date_time.day(),
+            date_time.timezone_offset(),
+        )
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<Date> for GMonthDay {
+    type Error = DateTimeError;
+
+    fn try_from(date: Date) -> Result<Self, DateTimeError> {
+        GMonthDay::new(date.month(), date.day(), date.timezone_offset())
+    }
+}
+
+impl FromStr for GMonthDay {
+    type Err = XsdParseError;
+
+    fn from_str(input: &str) -> Result<Self, XsdParseError> {
+        parse_value(g_month_day_lexical_rep, input)
+    }
+}
+
+impl fmt::Display for GMonthDay {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "--{:02}-{:02}", self.month(), self.day())?;
+        if let Some(timezone_offset) = self.timezone_offset() {
+            write!(f, "{}", timezone_offset)?;
+        }
+        Ok(())
+    }
+}
+
+/// [XML Schema `gMonth` datatype](https://www.w3.org/TR/xmlschema11-2/#gMonth) implementation.
+#[derive(Eq, PartialEq, PartialOrd, Debug, Clone, Copy, Hash)]
+pub struct GMonth {
+    timestamp: Timestamp,
+}
+
+impl GMonth {
+    pub(super) fn new(
+        month: u8,
+        timezone_offset: Option<TimezoneOffset>,
+    ) -> Result<Self, DateTimeError> {
+        Ok(Self {
+            timestamp: Timestamp::new(&DateTimeSevenPropertyModel {
+                year: None,
+                month: Some(month),
+                day: None,
+                hour: None,
+                minute: None,
+                second: None,
+                timezone_offset,
+            })?,
+        })
+    }
+
+    pub fn from_be_bytes(bytes: [u8; 18]) -> Self {
+        Self {
+            timestamp: Timestamp::from_be_bytes(bytes),
+        }
+    }
+
+    pub fn month(&self) -> u8 {
+        self.timestamp.month()
+    }
+
+    pub fn timezone(&self) -> Option<DayTimeDuration> {
+        Some(self.timezone_offset()?.into())
+    }
+
+    pub fn timezone_offset(&self) -> Option<TimezoneOffset> {
+        self.timestamp.timezone_offset()
+    }
+
+    pub fn to_be_bytes(&self) -> [u8; 18] {
+        self.timestamp.to_be_bytes()
+    }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<DateTime> for GMonth {
+    type Error = DateTimeError;
+
+    fn try_from(date_time: DateTime) -> Result<Self, DateTimeError> {
+        GMonth::new(date_time.month(), date_time.timezone_offset())
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<Date> for GMonth {
+    type Error = DateTimeError;
+
+    fn try_from(date: Date) -> Result<Self, DateTimeError> {
+        GMonth::new(date.month(), date.timezone_offset())
+    }
+}
+
+impl TryFrom<GYearMonth> for GMonth {
+    type Error = DateTimeError;
+
+    fn try_from(year_month: GYearMonth) -> Result<Self, DateTimeError> {
+        GMonth::new(year_month.month(), year_month.timezone_offset())
+    }
+}
+
+impl TryFrom<GMonthDay> for GMonth {
+    type Error = DateTimeError;
+
+    fn try_from(month_day: GMonthDay) -> Result<Self, DateTimeError> {
+        GMonth::new(month_day.month(), month_day.timezone_offset())
+    }
+}
+
+impl FromStr for GMonth {
+    type Err = XsdParseError;
+
+    fn from_str(input: &str) -> Result<Self, XsdParseError> {
+        parse_value(g_month_lexical_rep, input)
+    }
+}
+
+impl fmt::Display for GMonth {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "--{:02}", self.month())?;
+        if let Some(timezone_offset) = self.timezone_offset() {
+            write!(f, "{}", timezone_offset)?;
+        }
+        Ok(())
+    }
+}
+
+/// [XML Schema `date` datatype](https://www.w3.org/TR/xmlschema11-2/#date) implementation.
+#[derive(Eq, PartialEq, PartialOrd, Debug, Clone, Copy, Hash)]
+pub struct GDay {
+    timestamp: Timestamp,
+}
+
+impl GDay {
+    pub(super) fn new(
+        day: u8,
+        timezone_offset: Option<TimezoneOffset>,
+    ) -> Result<Self, DateTimeError> {
+        Ok(Self {
+            timestamp: Timestamp::new(&DateTimeSevenPropertyModel {
+                year: None,
+                month: None,
+                day: Some(day),
+                hour: None,
+                minute: None,
+                second: None,
+                timezone_offset,
+            })?,
+        })
+    }
+
+    pub fn from_be_bytes(bytes: [u8; 18]) -> Self {
+        Self {
+            timestamp: Timestamp::from_be_bytes(bytes),
+        }
+    }
+
+    pub fn day(&self) -> u8 {
+        self.timestamp.day()
+    }
+
+    pub fn timezone(&self) -> Option<DayTimeDuration> {
+        Some(self.timezone_offset()?.into())
+    }
+
+    pub fn timezone_offset(&self) -> Option<TimezoneOffset> {
+        self.timestamp.timezone_offset()
+    }
+
+    pub fn to_be_bytes(&self) -> [u8; 18] {
+        self.timestamp.to_be_bytes()
+    }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.timestamp.is_identical_with(&other.timestamp)
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<DateTime> for GDay {
+    type Error = DateTimeError;
+
+    fn try_from(date_time: DateTime) -> Result<Self, DateTimeError> {
+        GDay::new(date_time.day(), date_time.timezone_offset())
+    }
+}
+
+/// Conversion according to [XPath cast rules](https://www.w3.org/TR/xpath-functions/#casting-to-datetimes).
+impl TryFrom<Date> for GDay {
+    type Error = DateTimeError;
+
+    fn try_from(date: Date) -> Result<Self, DateTimeError> {
+        GDay::new(date.day(), date.timezone_offset())
+    }
+}
+
+impl TryFrom<GMonthDay> for GDay {
+    type Error = DateTimeError;
+
+    fn try_from(month_day: GMonthDay) -> Result<Self, DateTimeError> {
+        GDay::new(month_day.day(), month_day.timezone_offset())
+    }
+}
+
+impl FromStr for GDay {
+    type Err = XsdParseError;
+
+    fn from_str(input: &str) -> Result<Self, XsdParseError> {
+        parse_value(g_day_lexical_rep, input)
+    }
+}
+
+impl fmt::Display for GDay {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "---{:02}", self.day())?;
+        if let Some(timezone_offset) = self.timezone_offset() {
+            write!(f, "{}", timezone_offset)?;
+        }
+        Ok(())
+    }
+}
+
 #[derive(Eq, PartialEq, Debug, Clone, Copy, Hash)]
 pub struct TimezoneOffset {
     offset: i16, // in minute with respect to UTC
@@ -826,6 +1335,10 @@ impl Timestamp {
         });
         bytes
     }
+
+    pub fn is_identical_with(&self, other: &Self) -> bool {
+        self.value == other.value && self.timezone_offset == other.timezone_offset
+    }
 }
 
 #[cfg(target_arch = "wasm32")]
@@ -1178,12 +1691,12 @@ mod tests {
             "1899-03-01T00:00:00"
         );
 
-        /*TODO assert_eq!(
+        assert_eq!(
             DateTime::from_str("-1000000000-01-01T00:00:00")
                 .unwrap()
                 .to_string(),
             "-1000000000-01-01T00:00:00"
-        );*/
+        );
         assert_eq!(
             DateTime::from_str("-2001-12-31T23:59:59")
                 .unwrap()
@@ -1214,6 +1727,27 @@ mod tests {
                 .to_string(),
             "-1899-12-31T23:59:59"
         );
+
+        assert_eq!(
+            GYearMonth::from_str("-1899-12+01:00").unwrap().to_string(),
+            "-1899-12+01:00"
+        );
+        assert_eq!(
+            GYear::from_str("-1899+01:00").unwrap().to_string(),
+            "-1899+01:00"
+        );
+        assert_eq!(
+            GMonthDay::from_str("--01-01+01:00").unwrap().to_string(),
+            "--01-01+01:00"
+        );
+        assert_eq!(
+            GDay::from_str("---01+01:00").unwrap().to_string(),
+            "---01+01:00"
+        );
+        assert_eq!(
+            GMonth::from_str("--01+01:00").unwrap().to_string(),
+            "--01+01:00"
+        );
     }
 
     #[test]
@@ -1306,6 +1840,18 @@ mod tests {
             !(Time::from_str("08:00:00+09:00").unwrap()
                 > Time::from_str("17:00:00-06:00").unwrap())
         );
+
+        assert!(
+            GMonthDay::from_str("--12-12+13:00").unwrap()
+                < GMonthDay::from_str("--12-12+11:00").unwrap()
+        );
+        assert!(GDay::from_str("---15").unwrap() < GDay::from_str("---16").unwrap());
+        assert!(GDay::from_str("---15-13:00").unwrap() > GDay::from_str("---16+13:00").unwrap());
+        assert!(GDay::from_str("---15-11:00").unwrap() == GDay::from_str("---16+13:00").unwrap());
+        assert!(GDay::from_str("---15-13:00")
+            .unwrap()
+            .partial_cmp(&GDay::from_str("---16").unwrap())
+            .is_none());
     }
 
     #[test]
diff --git a/lib/src/model/xsd/mod.rs b/lib/src/model/xsd/mod.rs
index 0d7578b5..3f0466a2 100644
--- a/lib/src/model/xsd/mod.rs
+++ b/lib/src/model/xsd/mod.rs
@@ -3,7 +3,7 @@ pub mod decimal;
 mod duration;
 mod parser;
 
-pub use self::date_time::{Date, DateTime, Time};
+pub use self::date_time::{Date, DateTime, GDay, GMonth, GMonthDay, GYear, GYearMonth, Time};
 pub use self::decimal::Decimal;
 pub use self::duration::{DayTimeDuration, Duration, YearMonthDuration};
 pub use self::parser::XsdParseError;
diff --git a/lib/src/model/xsd/parser.rs b/lib/src/model/xsd/parser.rs
index 7caab99b..4d09545b 100644
--- a/lib/src/model/xsd/parser.rs
+++ b/lib/src/model/xsd/parser.rs
@@ -12,7 +12,7 @@ use std::str::FromStr;
 
 use super::date_time::DateTimeError;
 use super::decimal::ParseDecimalError;
-use crate::model::xsd::date_time::TimezoneOffset;
+use crate::model::xsd::date_time::{GDay, GMonth, GMonthDay, GYear, GYearMonth, TimezoneOffset};
 use crate::model::xsd::duration::{DayTimeDuration, YearMonthDuration};
 use nom::bytes::streaming::take_while_m_n;
 use std::error::Error;
@@ -332,6 +332,59 @@ pub fn date_lexical_rep(input: &str) -> XsdResult<'_, Date> {
     )(input)
 }
 
+// [19]   gYearMonthLexicalRep ::= yearFrag '-' monthFrag timezoneFrag?
+pub fn g_year_month_lexical_rep(input: &str) -> XsdResult<'_, GYearMonth> {
+    map_res(
+        tuple((year_frag, char('-'), month_frag, opt(timezone_frag))),
+        |(year, _, month, timezone)| GYearMonth::new(year, month, timezone),
+    )(input)
+}
+
+// [20]   gYearLexicalRep ::= yearFrag timezoneFrag?
+pub fn g_year_lexical_rep(input: &str) -> XsdResult<'_, GYear> {
+    map_res(
+        tuple((year_frag, opt(timezone_frag))),
+        |(year, timezone)| GYear::new(year, timezone),
+    )(input)
+}
+
+// [21]   gMonthDayLexicalRep ::= '--' monthFrag '-' dayFrag timezoneFrag?   Constraint:  Day-of-month Representations
+pub fn g_month_day_lexical_rep(input: &str) -> XsdResult<'_, GMonthDay> {
+    map_res(
+        tuple((
+            char('-'),
+            char('-'),
+            month_frag,
+            char('-'),
+            day_frag,
+            opt(timezone_frag),
+        )),
+        |(_, _, month, _, day, timezone)| GMonthDay::new(month, day, timezone),
+    )(input)
+}
+
+// [22]   gDayLexicalRep ::= '---' dayFrag timezoneFrag?
+pub fn g_day_lexical_rep(input: &str) -> XsdResult<'_, GDay> {
+    map_res(
+        tuple((
+            char('-'),
+            char('-'),
+            char('-'),
+            day_frag,
+            opt(timezone_frag),
+        )),
+        |(_, _, _, day, timezone)| GDay::new(day, timezone),
+    )(input)
+}
+
+// [23]   gMonthLexicalRep ::= '--' monthFrag timezoneFrag?
+pub fn g_month_lexical_rep(input: &str) -> XsdResult<'_, GMonth> {
+    map_res(
+        tuple((char('-'), char('-'), month_frag, opt(timezone_frag))),
+        |(_, _, month, timezone)| GMonth::new(month, timezone),
+    )(input)
+}
+
 // [42]   yearMonthDurationLexicalRep ::= '-'? 'P' duYearMonthFrag
 pub fn year_month_duration_lexical_rep(input: &str) -> XsdResult<'_, YearMonthDuration> {
     map(
diff --git a/lib/src/sparql/eval.rs b/lib/src/sparql/eval.rs
index 94e58d76..2f80d86c 100644
--- a/lib/src/sparql/eval.rs
+++ b/lib/src/sparql/eval.rs
@@ -1,3 +1,4 @@
+use crate::model::vocab::{rdf, xsd};
 use crate::model::xsd::*;
 use crate::model::Triple;
 use crate::model::{BlankNode, LiteralRef, NamedNodeRef};
@@ -1281,49 +1282,66 @@ where
                 }
             }
             PlanExpression::Year(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.year().into()),
+                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
+                EncodedTerm::GYearMonthLiteral(year_month) => Some(year_month.year().into()),
+                EncodedTerm::GYearLiteral(year) => Some(year.year().into()),
                 _ => None,
             },
             PlanExpression::Month(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.month().into()),
+                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
+                EncodedTerm::GYearMonthLiteral(year_month) => Some(year_month.month().into()),
+                EncodedTerm::GMonthDayLiteral(month_day) => Some(month_day.month().into()),
+                EncodedTerm::GMonthLiteral(month) => Some(month.month().into()),
                 _ => None,
             },
             PlanExpression::Day(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.day().into()),
+                EncodedTerm::DateLiteral(date) => Some(date.year().into()),
+                EncodedTerm::GMonthDayLiteral(month_day) => Some(month_day.day().into()),
+                EncodedTerm::GDayLiteral(day) => Some(day.day().into()),
                 _ => None,
             },
             PlanExpression::Hours(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::TimeLiteral(time) => Some(time.hour().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.hour().into()),
+                EncodedTerm::TimeLiteral(time) => Some(time.hour().into()),
                 _ => None,
             },
             PlanExpression::Minutes(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::TimeLiteral(time) => Some(time.minute().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.minute().into()),
+                EncodedTerm::TimeLiteral(time) => Some(time.minute().into()),
                 _ => None,
             },
             PlanExpression::Seconds(e) => match self.eval_expression(e, tuple)? {
-                EncodedTerm::TimeLiteral(time) => Some(time.second().into()),
                 EncodedTerm::DateTimeLiteral(date_time) => Some(date_time.second().into()),
+                EncodedTerm::TimeLiteral(time) => Some(time.second().into()),
                 _ => None,
             },
             PlanExpression::Timezone(e) => Some(
                 match self.eval_expression(e, tuple)? {
-                    EncodedTerm::DateLiteral(date) => date.timezone(),
-                    EncodedTerm::TimeLiteral(time) => time.timezone(),
                     EncodedTerm::DateTimeLiteral(date_time) => date_time.timezone(),
+                    EncodedTerm::TimeLiteral(time) => time.timezone(),
+                    EncodedTerm::DateLiteral(date) => date.timezone(),
+                    EncodedTerm::GYearMonthLiteral(year_month) => year_month.timezone(),
+                    EncodedTerm::GYearLiteral(year) => year.timezone(),
+                    EncodedTerm::GMonthDayLiteral(month_day) => month_day.timezone(),
+                    EncodedTerm::GDayLiteral(day) => day.timezone(),
+                    EncodedTerm::GMonthLiteral(month) => month.timezone(),
                     _ => None,
                 }?
                 .into(),
             ),
             PlanExpression::Tz(e) => {
                 let timezone_offset = match self.eval_expression(e, tuple)? {
-                    EncodedTerm::DateLiteral(date) => date.timezone_offset(),
-                    EncodedTerm::TimeLiteral(time) => time.timezone_offset(),
                     EncodedTerm::DateTimeLiteral(date_time) => date_time.timezone_offset(),
+                    EncodedTerm::TimeLiteral(time) => time.timezone_offset(),
+                    EncodedTerm::DateLiteral(date) => date.timezone_offset(),
+                    EncodedTerm::GYearMonthLiteral(year_month) => year_month.timezone_offset(),
+                    EncodedTerm::GYearLiteral(year) => year.timezone_offset(),
+                    EncodedTerm::GMonthDayLiteral(month_day) => month_day.timezone_offset(),
+                    EncodedTerm::GDayLiteral(day) => day.timezone_offset(),
+                    EncodedTerm::GMonthLiteral(month) => month.timezone_offset(),
                     _ => return None,
                 };
                 match timezone_offset {
@@ -1589,9 +1607,14 @@ where
             EncodedTerm::DoubleLiteral(value) => self.build_string_id(&value.to_string()),
             EncodedTerm::IntegerLiteral(value) => self.build_string_id(&value.to_string()),
             EncodedTerm::DecimalLiteral(value) => self.build_string_id(&value.to_string()),
-            EncodedTerm::DateLiteral(value) => self.build_string_id(&value.to_string()),
-            EncodedTerm::TimeLiteral(value) => self.build_string_id(&value.to_string()),
             EncodedTerm::DateTimeLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::TimeLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::DateLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::GYearMonthLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::GYearLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::GMonthDayLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::GDayLiteral(value) => self.build_string_id(&value.to_string()),
+            EncodedTerm::GMonthLiteral(value) => self.build_string_id(&value.to_string()),
             EncodedTerm::DurationLiteral(value) => self.build_string_id(&value.to_string()),
             EncodedTerm::YearMonthDurationLiteral(value) => {
                 self.build_string_id(&value.to_string())
@@ -1928,8 +1951,8 @@ where
                 EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
                 _ => Some(false),
             },
-            EncodedTerm::DateLiteral(a) => match b {
-                EncodedTerm::DateLiteral(b) => Some(a == b),
+            EncodedTerm::DateTimeLiteral(a) => match b {
+                EncodedTerm::DateTimeLiteral(b) => Some(a == b),
                 EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
                 _ => Some(false),
             },
@@ -1938,8 +1961,33 @@ where
                 EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
                 _ => Some(false),
             },
-            EncodedTerm::DateTimeLiteral(a) => match b {
-                EncodedTerm::DateTimeLiteral(b) => Some(a == b),
+            EncodedTerm::DateLiteral(a) => match b {
+                EncodedTerm::DateLiteral(b) => Some(a == b),
+                EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
+                _ => Some(false),
+            },
+            EncodedTerm::GYearMonthLiteral(a) => match b {
+                EncodedTerm::GYearMonthLiteral(b) => Some(a == b),
+                EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
+                _ => Some(false),
+            },
+            EncodedTerm::GYearLiteral(a) => match b {
+                EncodedTerm::GYearLiteral(b) => Some(a == b),
+                EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
+                _ => Some(false),
+            },
+            EncodedTerm::GMonthDayLiteral(a) => match b {
+                EncodedTerm::GMonthDayLiteral(b) => Some(a == b),
+                EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
+                _ => Some(false),
+            },
+            EncodedTerm::GDayLiteral(a) => match b {
+                EncodedTerm::GDayLiteral(b) => Some(a == b),
+                EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
+                _ => Some(false),
+            },
+            EncodedTerm::GMonthLiteral(a) => match b {
+                EncodedTerm::GMonthLiteral(b) => Some(a == b),
                 EncodedTerm::SmallTypedLiteral { .. } | EncodedTerm::BigTypedLiteral { .. } => None,
                 _ => Some(false),
             },
@@ -2062,8 +2110,8 @@ where
                 EncodedTerm::DecimalLiteral(ref b) => a.partial_cmp(b),
                 _ => None,
             },
-            EncodedTerm::DateLiteral(a) => {
-                if let EncodedTerm::DateLiteral(ref b) = b {
+            EncodedTerm::DateTimeLiteral(a) => {
+                if let EncodedTerm::DateTimeLiteral(ref b) = b {
                     a.partial_cmp(b)
                 } else {
                     None
@@ -2076,8 +2124,43 @@ where
                     None
                 }
             }
-            EncodedTerm::DateTimeLiteral(a) => {
-                if let EncodedTerm::DateTimeLiteral(ref b) = b {
+            EncodedTerm::DateLiteral(a) => {
+                if let EncodedTerm::DateLiteral(ref b) = b {
+                    a.partial_cmp(b)
+                } else {
+                    None
+                }
+            }
+            EncodedTerm::GYearMonthLiteral(a) => {
+                if let EncodedTerm::GYearMonthLiteral(ref b) = b {
+                    a.partial_cmp(b)
+                } else {
+                    None
+                }
+            }
+            EncodedTerm::GYearLiteral(a) => {
+                if let EncodedTerm::GYearLiteral(ref b) = b {
+                    a.partial_cmp(b)
+                } else {
+                    None
+                }
+            }
+            EncodedTerm::GMonthDayLiteral(a) => {
+                if let EncodedTerm::GMonthDayLiteral(ref b) = b {
+                    a.partial_cmp(b)
+                } else {
+                    None
+                }
+            }
+            EncodedTerm::GDayLiteral(a) => {
+                if let EncodedTerm::GDayLiteral(ref b) = b {
+                    a.partial_cmp(b)
+                } else {
+                    None
+                }
+            }
+            EncodedTerm::GMonthLiteral(a) => {
+                if let EncodedTerm::GMonthLiteral(ref b) = b {
                     a.partial_cmp(b)
                 } else {
                     None
@@ -2141,50 +2224,37 @@ where
             | EncodedTerm::NumericalBlankNode { .. }
             | EncodedTerm::DefaultGraph => None,
             EncodedTerm::SmallStringLiteral(_) | EncodedTerm::BigStringLiteral { .. } => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#string")
+                self.build_named_node(xsd::STRING.as_str())
             }
             EncodedTerm::SmallSmallLangStringLiteral { .. }
             | EncodedTerm::SmallBigLangStringLiteral { .. }
             | EncodedTerm::BigSmallLangStringLiteral { .. }
             | EncodedTerm::BigBigLangStringLiteral { .. } => {
-                self.build_named_node("http://www.w3.org/1999/02/22-rdf-syntax-ns#langString")
+                self.build_named_node(rdf::LANG_STRING.as_str())
             }
             EncodedTerm::SmallTypedLiteral { datatype_id, .. }
             | EncodedTerm::BigTypedLiteral { datatype_id, .. } => Some(EncodedTerm::NamedNode {
                 iri_id: datatype_id,
             }),
-            EncodedTerm::BooleanLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#boolean")
-            }
-            EncodedTerm::FloatLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#float")
-            }
-            EncodedTerm::DoubleLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#double")
-            }
-            EncodedTerm::IntegerLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#integer")
-            }
-            EncodedTerm::DecimalLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#decimal")
-            }
-            EncodedTerm::DateLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#date")
-            }
-            EncodedTerm::TimeLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#time")
-            }
-            EncodedTerm::DateTimeLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#dateTime")
-            }
-            EncodedTerm::DurationLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#duration")
-            }
+            EncodedTerm::BooleanLiteral(..) => self.build_named_node(xsd::BOOLEAN.as_str()),
+            EncodedTerm::FloatLiteral(..) => self.build_named_node(xsd::FLOAT.as_str()),
+            EncodedTerm::DoubleLiteral(..) => self.build_named_node(xsd::DOUBLE.as_str()),
+            EncodedTerm::IntegerLiteral(..) => self.build_named_node(xsd::INTEGER.as_str()),
+            EncodedTerm::DecimalLiteral(..) => self.build_named_node(xsd::DECIMAL.as_str()),
+            EncodedTerm::DateTimeLiteral(..) => self.build_named_node(xsd::DATE_TIME.as_str()),
+            EncodedTerm::TimeLiteral(..) => self.build_named_node(xsd::TIME.as_str()),
+            EncodedTerm::DateLiteral(..) => self.build_named_node(xsd::DATE.as_str()),
+            EncodedTerm::GYearMonthLiteral(..) => self.build_named_node(xsd::G_YEAR_MONTH.as_str()),
+            EncodedTerm::GYearLiteral(..) => self.build_named_node(xsd::G_YEAR.as_str()),
+            EncodedTerm::GMonthDayLiteral(..) => self.build_named_node(xsd::G_MONTH_DAY.as_str()),
+            EncodedTerm::GDayLiteral(..) => self.build_named_node(xsd::G_DAY.as_str()),
+            EncodedTerm::GMonthLiteral(..) => self.build_named_node(xsd::G_MONTH.as_str()),
+            EncodedTerm::DurationLiteral(..) => self.build_named_node(xsd::DURATION.as_str()),
             EncodedTerm::YearMonthDurationLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#yearMonthDuration")
+                self.build_named_node(xsd::YEAR_MONTH_DURATION.as_str())
             }
             EncodedTerm::DayTimeDurationLiteral(..) => {
-                self.build_named_node("http://www.w3.org/2001/XMLSchema#dayTimeDuration")
+                self.build_named_node(xsd::DAY_TIME_DURATION.as_str())
             }
         }
     }
diff --git a/lib/src/store/binary_encoder.rs b/lib/src/store/binary_encoder.rs
index 89fa75df..b818e343 100644
--- a/lib/src/store/binary_encoder.rs
+++ b/lib/src/store/binary_encoder.rs
@@ -39,11 +39,16 @@ const TYPE_DOUBLE_LITERAL: u8 = 31;
 const TYPE_INTEGER_LITERAL: u8 = 32;
 const TYPE_DECIMAL_LITERAL: u8 = 33;
 const TYPE_DATE_TIME_LITERAL: u8 = 34;
-const TYPE_DATE_LITERAL: u8 = 35;
-const TYPE_TIME_LITERAL: u8 = 36;
-const TYPE_DURATION_LITERAL: u8 = 37;
-const TYPE_YEAR_MONTH_DURATION_LITERAL: u8 = 38;
-const TYPE_DAY_TIME_DURATION_LITERAL: u8 = 39;
+const TYPE_TIME_LITERAL: u8 = 35;
+const TYPE_DATE_LITERAL: u8 = 36;
+const TYPE_G_YEAR_MONTH_LITERAL: u8 = 37;
+const TYPE_G_YEAR_LITERAL: u8 = 38;
+const TYPE_G_MONTH_DAY_LITERAL: u8 = 39;
+const TYPE_G_DAY_LITERAL: u8 = 40;
+const TYPE_G_MONTH_LITERAL: u8 = 41;
+const TYPE_DURATION_LITERAL: u8 = 42;
+const TYPE_YEAR_MONTH_DURATION_LITERAL: u8 = 43;
+const TYPE_DAY_TIME_DURATION_LITERAL: u8 = 44;
 
 #[derive(Eq, PartialEq, Debug, Copy, Clone, Hash)]
 #[repr(transparent)]
@@ -354,23 +359,52 @@ impl<R: Read> TermReader for R {
                 self.read_exact(&mut buffer)?;
                 Ok(EncodedTerm::DecimalLiteral(Decimal::from_be_bytes(buffer)))
             }
-            TYPE_DATE_LITERAL => {
+            TYPE_DATE_TIME_LITERAL => {
                 let mut buffer = [0; 18];
                 self.read_exact(&mut buffer)?;
-                Ok(EncodedTerm::DateLiteral(Date::from_be_bytes(buffer)))
+                Ok(EncodedTerm::DateTimeLiteral(DateTime::from_be_bytes(
+                    buffer,
+                )))
             }
             TYPE_TIME_LITERAL => {
                 let mut buffer = [0; 18];
                 self.read_exact(&mut buffer)?;
                 Ok(EncodedTerm::TimeLiteral(Time::from_be_bytes(buffer)))
             }
-            TYPE_DATE_TIME_LITERAL => {
+            TYPE_DATE_LITERAL => {
                 let mut buffer = [0; 18];
                 self.read_exact(&mut buffer)?;
-                Ok(EncodedTerm::DateTimeLiteral(DateTime::from_be_bytes(
+                Ok(EncodedTerm::DateLiteral(Date::from_be_bytes(buffer)))
+            }
+            TYPE_G_YEAR_MONTH_LITERAL => {
+                let mut buffer = [0; 18];
+                self.read_exact(&mut buffer)?;
+                Ok(EncodedTerm::GYearMonthLiteral(GYearMonth::from_be_bytes(
                     buffer,
                 )))
             }
+            TYPE_G_YEAR_LITERAL => {
+                let mut buffer = [0; 18];
+                self.read_exact(&mut buffer)?;
+                Ok(EncodedTerm::GYearLiteral(GYear::from_be_bytes(buffer)))
+            }
+            TYPE_G_MONTH_DAY_LITERAL => {
+                let mut buffer = [0; 18];
+                self.read_exact(&mut buffer)?;
+                Ok(EncodedTerm::GMonthDayLiteral(GMonthDay::from_be_bytes(
+                    buffer,
+                )))
+            }
+            TYPE_G_DAY_LITERAL => {
+                let mut buffer = [0; 18];
+                self.read_exact(&mut buffer)?;
+                Ok(EncodedTerm::GDayLiteral(GDay::from_be_bytes(buffer)))
+            }
+            TYPE_G_MONTH_LITERAL => {
+                let mut buffer = [0; 18];
+                self.read_exact(&mut buffer)?;
+                Ok(EncodedTerm::GMonthLiteral(GMonth::from_be_bytes(buffer)))
+            }
             TYPE_DURATION_LITERAL => {
                 let mut buffer = [0; 24];
                 self.read_exact(&mut buffer)?;
@@ -573,22 +607,42 @@ pub fn write_term(sink: &mut Vec<u8>, term: EncodedTerm) {
             sink.push(TYPE_DECIMAL_LITERAL);
             sink.extend_from_slice(&value.to_be_bytes())
         }
-        EncodedTerm::DateLiteral(value) => {
-            sink.push(TYPE_DATE_LITERAL);
+        EncodedTerm::DateTimeLiteral(value) => {
+            sink.push(TYPE_DATE_TIME_LITERAL);
             sink.extend_from_slice(&value.to_be_bytes())
         }
         EncodedTerm::TimeLiteral(value) => {
             sink.push(TYPE_TIME_LITERAL);
             sink.extend_from_slice(&value.to_be_bytes())
         }
-        EncodedTerm::DateTimeLiteral(value) => {
-            sink.push(TYPE_DATE_TIME_LITERAL);
-            sink.extend_from_slice(&value.to_be_bytes())
-        }
         EncodedTerm::DurationLiteral(value) => {
             sink.push(TYPE_DURATION_LITERAL);
             sink.extend_from_slice(&value.to_be_bytes())
         }
+        EncodedTerm::DateLiteral(value) => {
+            sink.push(TYPE_DATE_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
+        EncodedTerm::GYearMonthLiteral(value) => {
+            sink.push(TYPE_G_YEAR_MONTH_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
+        EncodedTerm::GYearLiteral(value) => {
+            sink.push(TYPE_G_YEAR_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
+        EncodedTerm::GMonthDayLiteral(value) => {
+            sink.push(TYPE_G_MONTH_DAY_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
+        EncodedTerm::GDayLiteral(value) => {
+            sink.push(TYPE_G_DAY_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
+        EncodedTerm::GMonthLiteral(value) => {
+            sink.push(TYPE_G_MONTH_LITERAL);
+            sink.extend_from_slice(&value.to_be_bytes())
+        }
         EncodedTerm::YearMonthDurationLiteral(value) => {
             sink.push(TYPE_YEAR_MONTH_DURATION_LITERAL);
             sink.extend_from_slice(&value.to_be_bytes())
@@ -686,7 +740,14 @@ mod test {
             Literal::new_typed_literal("2020-01-01T01:01:01Z", xsd::DATE_TIME).into(),
             Literal::new_typed_literal("2020-01-01", xsd::DATE).into(),
             Literal::new_typed_literal("01:01:01Z", xsd::TIME).into(),
+            Literal::new_typed_literal("2020-01", xsd::G_YEAR_MONTH).into(),
+            Literal::new_typed_literal("2020", xsd::G_YEAR).into(),
+            Literal::new_typed_literal("--01-01", xsd::G_MONTH_DAY).into(),
+            Literal::new_typed_literal("--01", xsd::G_MONTH).into(),
+            Literal::new_typed_literal("---01", xsd::G_DAY).into(),
             Literal::new_typed_literal("PT1S", xsd::DURATION).into(),
+            Literal::new_typed_literal("PT1S", xsd::DAY_TIME_DURATION).into(),
+            Literal::new_typed_literal("P1Y", xsd::YEAR_MONTH_DURATION).into(),
             Literal::new_typed_literal("-foo", NamedNode::new_unchecked("http://foo.com")).into(),
             Literal::new_typed_literal(
                 "-foo-thisisaverybigtypedliteralwiththefoodatatype",
diff --git a/lib/src/store/numeric_encoder.rs b/lib/src/store/numeric_encoder.rs
index 7170a4f3..90899b95 100644
--- a/lib/src/store/numeric_encoder.rs
+++ b/lib/src/store/numeric_encoder.rs
@@ -63,9 +63,14 @@ pub enum EncodedTerm<I: StrId> {
     DoubleLiteral(f64),
     IntegerLiteral(i64),
     DecimalLiteral(Decimal),
-    DateLiteral(Date),
-    TimeLiteral(Time),
     DateTimeLiteral(DateTime),
+    TimeLiteral(Time),
+    DateLiteral(Date),
+    GYearMonthLiteral(GYearMonth),
+    GYearLiteral(GYear),
+    GMonthDayLiteral(GMonthDay),
+    GDayLiteral(GDay),
+    GMonthLiteral(GMonth),
     DurationLiteral(Duration),
     YearMonthDurationLiteral(YearMonthDuration),
     DayTimeDurationLiteral(DayTimeDuration),
@@ -171,9 +176,14 @@ impl<I: StrId> PartialEq for EncodedTerm<I> {
             }
             (Self::IntegerLiteral(a), Self::IntegerLiteral(b)) => a == b,
             (Self::DecimalLiteral(a), Self::DecimalLiteral(b)) => a == b,
-            (Self::DateLiteral(a), Self::DateLiteral(b)) => a == b,
-            (Self::TimeLiteral(a), Self::TimeLiteral(b)) => a == b,
-            (Self::DateTimeLiteral(a), Self::DateTimeLiteral(b)) => a == b,
+            (Self::DateTimeLiteral(a), Self::DateTimeLiteral(b)) => a.is_identical_with(b),
+            (Self::TimeLiteral(a), Self::TimeLiteral(b)) => a.is_identical_with(b),
+            (Self::DateLiteral(a), Self::DateLiteral(b)) => a.is_identical_with(b),
+            (Self::GYearMonthLiteral(a), Self::GYearMonthLiteral(b)) => a.is_identical_with(b),
+            (Self::GYearLiteral(a), Self::GYearLiteral(b)) => a.is_identical_with(b),
+            (Self::GMonthDayLiteral(a), Self::GMonthDayLiteral(b)) => a.is_identical_with(b),
+            (Self::GMonthLiteral(a), Self::GMonthLiteral(b)) => a.is_identical_with(b),
+            (Self::GDayLiteral(a), Self::GDayLiteral(b)) => a.is_identical_with(b),
             (Self::DurationLiteral(a), Self::DurationLiteral(b)) => a == b,
             (Self::YearMonthDurationLiteral(a), Self::YearMonthDurationLiteral(b)) => a == b,
             (Self::DayTimeDurationLiteral(a), Self::DayTimeDurationLiteral(b)) => a == b,
@@ -229,9 +239,14 @@ impl<I: StrId> Hash for EncodedTerm<I> {
             Self::DoubleLiteral(value) => state.write(&value.to_ne_bytes()),
             Self::IntegerLiteral(value) => value.hash(state),
             Self::DecimalLiteral(value) => value.hash(state),
-            Self::DateLiteral(value) => value.hash(state),
-            Self::TimeLiteral(value) => value.hash(state),
             Self::DateTimeLiteral(value) => value.hash(state),
+            Self::TimeLiteral(value) => value.hash(state),
+            Self::DateLiteral(value) => value.hash(state),
+            Self::GYearMonthLiteral(value) => value.hash(state),
+            Self::GYearLiteral(value) => value.hash(state),
+            Self::GMonthDayLiteral(value) => value.hash(state),
+            Self::GDayLiteral(value) => value.hash(state),
+            Self::GMonthLiteral(value) => value.hash(state),
             Self::DurationLiteral(value) => value.hash(state),
             Self::YearMonthDurationLiteral(value) => value.hash(state),
             Self::DayTimeDurationLiteral(value) => value.hash(state),
@@ -271,9 +286,14 @@ impl<I: StrId> EncodedTerm<I> {
             | Self::DoubleLiteral(_)
             | Self::IntegerLiteral(_)
             | Self::DecimalLiteral(_)
-            | Self::DateLiteral(_)
-            | Self::TimeLiteral(_)
             | Self::DateTimeLiteral(_)
+            | Self::TimeLiteral(_)
+            | Self::DateLiteral(_)
+            | Self::GYearMonthLiteral(_)
+            | Self::GYearLiteral(_)
+            | Self::GMonthDayLiteral(_)
+            | Self::GDayLiteral(_)
+            | Self::GMonthLiteral(_)
             | Self::DurationLiteral(_)
             | Self::YearMonthDurationLiteral(_)
             | Self::DayTimeDurationLiteral(_) => true,
@@ -338,9 +358,14 @@ impl<I: StrId> EncodedTerm<I> {
             Self::DoubleLiteral(value) => EncodedTerm::DoubleLiteral(value),
             Self::IntegerLiteral(value) => EncodedTerm::IntegerLiteral(value),
             Self::DecimalLiteral(value) => EncodedTerm::DecimalLiteral(value),
+            Self::DateTimeLiteral(value) => EncodedTerm::DateTimeLiteral(value),
             Self::DateLiteral(value) => EncodedTerm::DateLiteral(value),
             Self::TimeLiteral(value) => EncodedTerm::TimeLiteral(value),
-            Self::DateTimeLiteral(value) => EncodedTerm::DateTimeLiteral(value),
+            Self::GYearMonthLiteral(value) => EncodedTerm::GYearMonthLiteral(value),
+            Self::GYearLiteral(value) => EncodedTerm::GYearLiteral(value),
+            Self::GMonthDayLiteral(value) => EncodedTerm::GMonthDayLiteral(value),
+            Self::GDayLiteral(value) => EncodedTerm::GDayLiteral(value),
+            Self::GMonthLiteral(value) => EncodedTerm::GMonthLiteral(value),
             Self::DurationLiteral(value) => EncodedTerm::DurationLiteral(value),
             Self::YearMonthDurationLiteral(value) => EncodedTerm::YearMonthDurationLiteral(value),
             Self::DayTimeDurationLiteral(value) => EncodedTerm::DayTimeDurationLiteral(value),
@@ -400,9 +425,14 @@ impl<I: StrId> EncodedTerm<I> {
             Self::DoubleLiteral(value) => EncodedTerm::DoubleLiteral(value),
             Self::IntegerLiteral(value) => EncodedTerm::IntegerLiteral(value),
             Self::DecimalLiteral(value) => EncodedTerm::DecimalLiteral(value),
+            Self::DateTimeLiteral(value) => EncodedTerm::DateTimeLiteral(value),
             Self::DateLiteral(value) => EncodedTerm::DateLiteral(value),
             Self::TimeLiteral(value) => EncodedTerm::TimeLiteral(value),
-            Self::DateTimeLiteral(value) => EncodedTerm::DateTimeLiteral(value),
+            Self::GYearMonthLiteral(value) => EncodedTerm::GYearMonthLiteral(value),
+            Self::GYearLiteral(value) => EncodedTerm::GYearLiteral(value),
+            Self::GMonthDayLiteral(value) => EncodedTerm::GMonthDayLiteral(value),
+            Self::GDayLiteral(value) => EncodedTerm::GDayLiteral(value),
+            Self::GMonthLiteral(value) => EncodedTerm::GMonthLiteral(value),
             Self::DurationLiteral(value) => EncodedTerm::DurationLiteral(value),
             Self::YearMonthDurationLiteral(value) => EncodedTerm::YearMonthDurationLiteral(value),
             Self::DayTimeDurationLiteral(value) => EncodedTerm::DayTimeDurationLiteral(value),
@@ -457,9 +487,9 @@ impl<I: StrId> From<Decimal> for EncodedTerm<I> {
     }
 }
 
-impl<I: StrId> From<Date> for EncodedTerm<I> {
-    fn from(value: Date) -> Self {
-        Self::DateLiteral(value)
+impl<I: StrId> From<DateTime> for EncodedTerm<I> {
+    fn from(value: DateTime) -> Self {
+        Self::DateTimeLiteral(value)
     }
 }
 
@@ -469,9 +499,9 @@ impl<I: StrId> From<Time> for EncodedTerm<I> {
     }
 }
 
-impl<I: StrId> From<DateTime> for EncodedTerm<I> {
-    fn from(value: DateTime) -> Self {
-        Self::DateTimeLiteral(value)
+impl<I: StrId> From<Date> for EncodedTerm<I> {
+    fn from(value: Date) -> Self {
+        Self::DateLiteral(value)
     }
 }
 
@@ -660,10 +690,15 @@ pub(crate) trait ReadEncoder: WithStoreError {
                 | "http://www.w3.org/2001/XMLSchema#nonPositiveInteger"
                 | "http://www.w3.org/2001/XMLSchema#nonNegativeInteger" => parse_integer_str(value),
                 "http://www.w3.org/2001/XMLSchema#decimal" => parse_decimal_str(value),
-                "http://www.w3.org/2001/XMLSchema#date" => parse_date_str(value),
-                "http://www.w3.org/2001/XMLSchema#time" => parse_time_str(value),
                 "http://www.w3.org/2001/XMLSchema#dateTime"
                 | "http://www.w3.org/2001/XMLSchema#dateTimeStamp" => parse_date_time_str(value),
+                "http://www.w3.org/2001/XMLSchema#time" => parse_time_str(value),
+                "http://www.w3.org/2001/XMLSchema#date" => parse_date_str(value),
+                "http://www.w3.org/2001/XMLSchema#gYearMonth" => parse_g_year_month_str(value),
+                "http://www.w3.org/2001/XMLSchema#gYear" => parse_g_year_str(value),
+                "http://www.w3.org/2001/XMLSchema#gMonthDay" => parse_g_month_day_str(value),
+                "http://www.w3.org/2001/XMLSchema#gDay" => parse_g_day_str(value),
+                "http://www.w3.org/2001/XMLSchema#gMonth" => parse_g_month_str(value),
                 "http://www.w3.org/2001/XMLSchema#duration" => parse_duration_str(value),
                 "http://www.w3.org/2001/XMLSchema#yearMonthDuration" => {
                     parse_year_month_duration_str(value)
@@ -949,12 +984,17 @@ pub(crate) trait WriteEncoder: WithStoreError {
                         parse_integer_str(value)
                     }
                     "http://www.w3.org/2001/XMLSchema#decimal" => parse_decimal_str(value),
-                    "http://www.w3.org/2001/XMLSchema#date" => parse_date_str(value),
-                    "http://www.w3.org/2001/XMLSchema#time" => parse_time_str(value),
                     "http://www.w3.org/2001/XMLSchema#dateTime"
                     | "http://www.w3.org/2001/XMLSchema#dateTimeStamp" => {
                         parse_date_time_str(value)
                     }
+                    "http://www.w3.org/2001/XMLSchema#time" => parse_time_str(value),
+                    "http://www.w3.org/2001/XMLSchema#date" => parse_date_str(value),
+                    "http://www.w3.org/2001/XMLSchema#gYearMonth" => parse_g_year_month_str(value),
+                    "http://www.w3.org/2001/XMLSchema#gYear" => parse_g_year_str(value),
+                    "http://www.w3.org/2001/XMLSchema#gMonthDay" => parse_g_month_day_str(value),
+                    "http://www.w3.org/2001/XMLSchema#gDay" => parse_g_day_str(value),
+                    "http://www.w3.org/2001/XMLSchema#gMonth" => parse_g_month_str(value),
                     "http://www.w3.org/2001/XMLSchema#duration" => parse_duration_str(value),
                     "http://www.w3.org/2001/XMLSchema#yearMonthDuration" => {
                         parse_year_month_duration_str(value)
@@ -1071,16 +1111,36 @@ pub fn parse_decimal_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
     value.parse().map(EncodedTerm::DecimalLiteral).ok()
 }
 
-pub fn parse_date_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
-    value.parse().map(EncodedTerm::DateLiteral).ok()
+pub fn parse_date_time_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::DateTimeLiteral).ok()
 }
 
 pub fn parse_time_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
     value.parse().map(EncodedTerm::TimeLiteral).ok()
 }
 
-pub fn parse_date_time_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
-    value.parse().map(EncodedTerm::DateTimeLiteral).ok()
+pub fn parse_date_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::DateLiteral).ok()
+}
+
+pub fn parse_g_year_month_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::GYearMonthLiteral).ok()
+}
+
+pub fn parse_g_year_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::GYearLiteral).ok()
+}
+
+pub fn parse_g_month_day_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::GMonthDayLiteral).ok()
+}
+
+pub fn parse_g_day_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::GDayLiteral).ok()
+}
+
+pub fn parse_g_month_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
+    value.parse().map(EncodedTerm::GMonthLiteral).ok()
 }
 
 pub fn parse_duration_str<I: StrId>(value: &str) -> Option<EncodedTerm<I>> {
@@ -1225,9 +1285,14 @@ impl<S: StrLookup> Decoder for S {
             EncodedTerm::DoubleLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::IntegerLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::DecimalLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::DateTimeLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::DateLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::TimeLiteral(value) => Ok(Literal::from(value).into()),
-            EncodedTerm::DateTimeLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::GYearMonthLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::GYearLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::GMonthDayLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::GDayLiteral(value) => Ok(Literal::from(value).into()),
+            EncodedTerm::GMonthLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::DurationLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::YearMonthDurationLiteral(value) => Ok(Literal::from(value).into()),
             EncodedTerm::DayTimeDurationLiteral(value) => Ok(Literal::from(value).into()),