Error parsing install.rdf: "RDF/XML syntax error: No namespace for about in " about rdf-parser-rdfxml HOT 5 CLOSED

Here's a very cursory testcase + patch. muffinresearch@327db61

Note it doesn't handle duplicates as mentioned here [1]:

The construction of RDF URI references from XML attributes can generate the same RDF URI references from different XML attributes. This can cause ambiguity in the grammar when matching attribute events (such as when rdf:about and about XML attributes are both present). Documents that have this are illegal.

[1] https://www.w3.org/TR/REC-rdf-syntax/#eventterm-attribute-URI

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This patch doesn't appear to be enough. With the patch above all the subjects for the install.rdf example are a blank node.

The problem is in this line - https://github.com/rdf-ext/rdf-parser-rdfxml/blob/master/index.js#L296

about is looked up with the expectation it is namespaced and in this case since it isn't it defaults to a blank node. ID would need to be dealt with in a similar way too.

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@muffinresearch The problem should be solved with this PR.

@timbl This parsers uses rdflib.js code. So this patch should be also added to rdflib.js.

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@muffinresearch npm version 0.3.1 contains the fix.

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@bergos thanks!

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