diff --git a/lib/src/sparql/algebra.rs b/lib/src/sparql/algebra.rs
index 87498ba3..f7e415fb 100644
--- a/lib/src/sparql/algebra.rs
+++ b/lib/src/sparql/algebra.rs
@@ -214,9 +214,9 @@ impl<'a> TryFrom<&'a String> for Query {
 #[derive(Eq, PartialEq, Debug, Clone, Hash)]
 pub struct Update {
     /// The update base IRI
-    pub base_iri: Option<Iri<String>>,
+    pub(super) base_iri: Option<Iri<String>>,
     /// The [update operations](https://www.w3.org/TR/sparql11-update/#formalModelGraphUpdate)
-    pub operations: Vec<GraphUpdateOperation>,
+    pub(super) operations: Vec<GraphUpdateOperation>,
 }
 
 impl Update {
@@ -224,6 +224,28 @@ impl Update {
     pub fn parse(update: &str, base_iri: Option<&str>) -> Result<Self, ParseError> {
         parse_update(update, base_iri)
     }
+
+    /// Returns [the query dataset specification](https://www.w3.org/TR/sparql11-query/#specifyingDataset) in [DELETE/INSERT operations](https://www.w3.org/TR/sparql11-update/#deleteInsert).
+    pub fn using_datasets(&self) -> impl Iterator<Item = &QueryDataset> {
+        self.operations.iter().filter_map(|operation| {
+            if let GraphUpdateOperation::DeleteInsert { using, .. } = operation {
+                Some(using)
+            } else {
+                None
+            }
+        })
+    }
+
+    /// Returns [the query dataset specification](https://www.w3.org/TR/sparql11-query/#specifyingDataset) in [DELETE/INSERT operations](https://www.w3.org/TR/sparql11-update/#deleteInsert).
+    pub fn using_datasets_mut(&mut self) -> impl Iterator<Item = &mut QueryDataset> {
+        self.operations.iter_mut().filter_map(|operation| {
+            if let GraphUpdateOperation::DeleteInsert { using, .. } = operation {
+                Some(using)
+            } else {
+                None
+            }
+        })
+    }
 }
 
 impl fmt::Display for Update {
diff --git a/lib/src/sparql/mod.rs b/lib/src/sparql/mod.rs
index 34dd2211..1f7b1b8c 100644
--- a/lib/src/sparql/mod.rs
+++ b/lib/src/sparql/mod.rs
@@ -1,8 +1,8 @@
 //! [SPARQL](https://www.w3.org/TR/sparql11-overview/) implementation.
 //!
-//! Stores execute SPARQL. See [`SledStore`](super::store::memory::SledStore::query()) for an example.
+//! Stores execute SPARQL. See [`SledStore`](super::store::sled::SledStore::query()) for an example.
 
-pub mod algebra;
+mod algebra;
 mod csv_results;
 mod dataset;
 mod error;
diff --git a/server/src/main.rs b/server/src/main.rs
index 68cff0ba..07ec38a0 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -22,7 +22,6 @@ use http_types::{
 };
 use oxigraph::io::{DatasetFormat, GraphFormat};
 use oxigraph::model::{GraphName, GraphNameRef, NamedNode, NamedOrBlankNode};
-use oxigraph::sparql::algebra::GraphUpdateOperation;
 use oxigraph::sparql::{Query, QueryResults, QueryResultsFormat, Update};
 use oxigraph::SledStore as Store;
 use oxiri::Iri;
@@ -494,16 +493,14 @@ fn evaluate_sparql_update(
         .collect::<Result<Vec<NamedOrBlankNode>>>()
         .map_err(bad_request)?;
     if !default_graph_uris.is_empty() || !named_graph_uris.is_empty() {
-        for operation in &mut update.operations {
-            if let GraphUpdateOperation::DeleteInsert { using, .. } = operation {
-                if !using.is_default_dataset() {
-                    bail_status!(400,
+        for using in update.using_datasets_mut() {
+            if !using.is_default_dataset() {
+                bail_status!(400,
                         "using-graph-uri and using-named-graph-uri must not be used with a SPARQL UPDATE containing USING",
                     );
-                }
-                using.set_default_graph(default_graph_uris.clone());
-                using.set_available_named_graphs(named_graph_uris.clone());
             }
+            using.set_default_graph(default_graph_uris.clone());
+            using.set_available_named_graphs(named_graph_uris.clone());
         }
     }
     store.update(update)?;