diff --git a/lib/src/model/graph.rs b/lib/src/model/graph.rs
index 557238d1..c7c2241b 100644
--- a/lib/src/model/graph.rs
+++ b/lib/src/model/graph.rs
@@ -174,6 +174,11 @@ impl Graph {
         self.graph_mut().remove(triple)
     }
 
+    /// Clears the graph
+    pub fn clear(&mut self) {
+        self.dataset.clear()
+    }
+
     /// Loads a file into the graph.
     ///
     /// Usage example:
diff --git a/testsuite/src/manifest.rs b/testsuite/src/manifest.rs
index 7fcf3c02..beac945b 100644
--- a/testsuite/src/manifest.rs
+++ b/testsuite/src/manifest.rs
@@ -246,43 +246,50 @@ impl Iterator for TestManifest {
             None => {
                 match self.manifests_to_do.pop() {
                     Some(url) => {
-                        let manifest = SubjectRef::from(NamedNodeRef::new(url.as_str()).unwrap());
+                        self.graph.clear();
                         if let Err(error) = load_to_graph(&url, &mut self.graph) {
                             return Some(Err(error));
                         }
 
-                        // New manifests
-                        match self
+                        for manifest in self
                             .graph
-                            .object_for_subject_predicate(manifest, mf::INCLUDE)
+                            .subjects_for_predicate_object(rdf::TYPE, mf::MANIFEST)
                         {
-                            Some(TermRef::BlankNode(list)) => {
-                                self.manifests_to_do.extend(
-                                    RdfListIterator::iter(&self.graph, list.into()).filter_map(
-                                        |m| match m {
-                                            Term::NamedNode(nm) => Some(nm.into_string()),
-                                            _ => None,
-                                        },
-                                    ),
-                                );
+                            match self
+                                .graph
+                                .object_for_subject_predicate(manifest, mf::INCLUDE)
+                            {
+                                Some(TermRef::BlankNode(list)) => {
+                                    self.manifests_to_do.extend(
+                                        RdfListIterator::iter(&self.graph, list.into()).filter_map(
+                                            |m| match m {
+                                                Term::NamedNode(nm) => Some(nm.into_string()),
+                                                _ => None,
+                                            },
+                                        ),
+                                    );
+                                }
+                                Some(_) => return Some(Err(anyhow!("invalid tests list"))),
+                                None => (),
                             }
-                            Some(_) => return Some(Err(anyhow!("invalid tests list"))),
-                            None => (),
-                        }
 
-                        // New tests
-                        match self
-                            .graph
-                            .object_for_subject_predicate(manifest, mf::ENTRIES)
-                        {
-                            Some(TermRef::BlankNode(list)) => {
-                                self.tests_to_do
-                                    .extend(RdfListIterator::iter(&self.graph, list.into()));
-                            }
-                            Some(term) => {
-                                return Some(Err(anyhow!("Invalid tests list. Got term {}", term)));
+                            // New tests
+                            match self
+                                .graph
+                                .object_for_subject_predicate(manifest, mf::ENTRIES)
+                            {
+                                Some(TermRef::BlankNode(list)) => {
+                                    self.tests_to_do
+                                        .extend(RdfListIterator::iter(&self.graph, list.into()));
+                                }
+                                Some(term) => {
+                                    return Some(Err(anyhow!(
+                                        "Invalid tests list. Got term {}",
+                                        term
+                                    )));
+                                }
+                                None => (),
                             }
-                            None => (),
                         }
                     }
                     None => return None,
diff --git a/testsuite/src/vocab.rs b/testsuite/src/vocab.rs
index b9e9b46c..33ed5283 100644
--- a/testsuite/src/vocab.rs
+++ b/testsuite/src/vocab.rs
@@ -34,6 +34,9 @@ pub mod mf {
     pub const ENTRIES: NamedNodeRef<'_> = NamedNodeRef::new_unchecked(
         "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#entries",
     );
+    pub const MANIFEST: NamedNodeRef<'_> = NamedNodeRef::new_unchecked(
+        "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#Manifest",
+    );
     pub const NAME: NamedNodeRef<'_> = NamedNodeRef::new_unchecked(
         "http://www.w3.org/2001/sw/DataAccess/tests/test-manifest#name",
     );