The SPARQL Results XML Format spec is silent regarding XMLLiteral datatypes, but the schemas specify that only "text" is allowed in an srx:literal element. This means that XMLLiteral values must have XML markup replaced with character entities, or enclosed in a CDATA section.
This is roadblock to fluent processing of RDF data that includes XMLLiteral values. Consider for the next revision to specify that XMLLiteral values be emitted as XML in a non-srx namespace. The attached patch to the rnc schema (available at http://www.w3.org/2005/sparql-results) enforces that srx:literal elements with datatype rdf:XMLLiteral must have element children from a non-srx namespace. (The patch also fixes the res: namespace in the schema, which does not match the namespace URI given in the spec.) Regards, --Paul
--- result.rnc 2013-08-21 21:51:05.000000000 -0500 +++ result+xml.rnc 2013-08-21 20:11:03.000000000 -0500 @@ -7,7 +7,7 @@ # namespace local = "" -namespace res = "http://www.w3.org/2007/SPARQL/results#"; +namespace res = "http://www.w3.org/2005/sparql-results#"; namespace xsi = "http://www.w3.org/2001/XMLSchema-instance"; datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"; @@ -68,7 +68,7 @@ # SELECT binding in a solution binding = element res:binding { nameAttr, - ( uri | bnode | literal ) + ( uri | bnode | literal | xmlLiteral ) } uri = element res:uri { @@ -84,13 +84,30 @@ text } +xmlLiteral = element res:literal { + datatypeAttrXmlLit, xmlLang?, + anyOtherNSElement +} + indexAttr = attribute local:index { xsd:positiveInteger } datatypeAttr = attribute local:datatype { - URI-reference + URI-referenceNotXmlLit +} + +datatypeAttrXmlLit = attribute local:datatype { + "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral"; } URI-reference = xsd:anyURI +URI-referenceNotXmlLit = xsd:anyURI - "http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral"; + +anyOtherNSElement = + element * - res:* { + (attribute * { text } + | text + | anyOtherNSElement)* + }
