Support namespace declarations on node elements and typed node elements (#72)

* Add support for namespace declaration using xmlns.

* Handle namespace declarations on resource nodes

* Support namespace declaration on typed elements

Author: matthiaspalmer

lib/RdfXmlParser.ts

@@ -306,7 +306,9 @@ while ${attribute.value} and ${activeSubjectValue} where found.`);
 
       // Interpret attributes at this point as properties on this node,
       // but we ignore attributes that have no prefix or known expanded URI
-      if (attribute.prefix !== 'xml' && attribute.uri) {
+      if (attribute.prefix !== 'xml' && attribute.prefix !== 'xmlns'
+          && (attribute.prefix !== '' || attribute.local !== 'xmlns')
+        && attribute.uri) {
         predicates.push(this.uriToNamedNode(attribute.uri + attribute.local));
         objects.push(attribute.value);
       }

test/RdfXmlParser-test.ts

@@ -930,20 +930,71 @@ abc`)).rejects.toBeTruthy();
           ]);
       });
 
-
-      it('declaration of the namespace on the element', async () => {
+      it('declaration of the default namespace on the property element', async () => {
         return expect(await parse(parser, `<?xml version="1.0"?>
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
-  <rdf:Description rdf:about="http://www.w3.org/TR/rdf-syntax-grammar">
+  <rdf:Description rdf:about="http://example.com">
        <title xmlns="http://purl.org/dc/terms/" xml:lang="en">RDF1.1 XML Syntax</title>
   </rdf:Description>
 </rdf:RDF>`))
             .toBeRdfIsomorphic([
-              quad('http://www.w3.org/TR/rdf-syntax-grammar',
+              quad('http://example.com',
                   'http://purl.org/dc/terms/title', '"RDF1.1 XML Syntax"@en'),
             ]);
       });
 
+      it('declaration of the namespace on the property element', async () => {
+        return expect(await parse(parser, `<?xml version="1.0"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <rdf:Description rdf:about="http://example.com">
+       <dct:title xmlns:dct="http://purl.org/dc/terms/" xml:lang="en">RDF1.1 XML Syntax</dct:title>
+  </rdf:Description>
+</rdf:RDF>`))
+            .toBeRdfIsomorphic([
+              quad('http://example.com',
+                  'http://purl.org/dc/terms/title', '"RDF1.1 XML Syntax"@en'),
+            ]);
+      });
+
+      it('declaration of the namespace on the resource element', async () => {
+        return expect(await parse(parser, `<?xml version="1.0"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <rdf:Description rdf:about="http://example.com" xmlns:dct="http://purl.org/dc/terms/">
+       <dct:title xml:lang="en">RDF1.1 XML Syntax</dct:title>
+  </rdf:Description>
+</rdf:RDF>`))
+            .toBeRdfIsomorphic([
+              quad('http://example.com',
+                  'http://purl.org/dc/terms/title', '"RDF1.1 XML Syntax"@en'),
+            ]);
+      });
+
+      it('declaration of the default namespace on the resource element', async () => {
+        return expect(await parse(parser, `<?xml version="1.0"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <rdf:Description rdf:about="http://example.com" xmlns="http://purl.org/dc/terms/">
+       <title xml:lang="en">RDF1.1 XML Syntax</title>
+  </rdf:Description>
+</rdf:RDF>`))
+            .toBeRdfIsomorphic([
+              quad('http://example.com',
+                  'http://purl.org/dc/terms/title', '"RDF1.1 XML Syntax"@en'),
+            ]);
+      });
+
+
+      it('declaration of the namespace on a typed resource element', async () => {
+        return expect(await parse(parser, `<?xml version="1.0"?>
+<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+  <dct:Standard rdf:about="http://example.com" xmlns:dct="http://purl.org/dc/terms/">
+  </dct:Standard>
+</rdf:RDF>`))
+            .toBeRdfIsomorphic([
+              quad('http://example.com',
+                  'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', 'http://purl.org/dc/terms/Standard'),
+            ]);
+      });
+
       it('cdata support', async () => {
         return expect(await parse(parser, `<?xml version="1.0"?>
 <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dct="http://purl.org/dc/terms/" >
@@ -957,7 +1008,6 @@ abc`)).rejects.toBeTruthy();
             ]);
       });
 
-
       it('DOCTYPE and ENTITY\'s', async () => {
         return expect(await parse(parser, `<!DOCTYPE rdf:RDF
 [<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#">