Parser seems to require actually-optional rdf:RDF root elements

(Reposting with problem-specific subject.)

report=The <rdf:RDF> is not always required, but the parser doesn't recognize any triples when the given XML document doesn't
have a root <rdf:RDF> element.

The RDF/XML specification currently at http://www.w3.org/TR/rdf-syntax-grammar/ says:

When there is only one top-level node element inside rdf:RDF, the rdf:RDF can be omitted ...



RDF=<?xml version="1.0">
<rdf:Description
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:dct="http://purl.org/dc/terms/"

     rdf:about="http://example.com/music#piece23">
   <dct:title>Machine</dct:title>
</rdf:Description>



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