[redland-dev] [Raptor RDF Syntax Library 0000516]: rdfxml-xmp output generates prohibited syntax

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://bugs.librdf.org/mantis/view.php?id=516 
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Reported By:                normang
Assigned To:                
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Project:                    Raptor RDF Syntax Library
Issue ID:                   516
Category:                   api
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Syntax Name:                 
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Date Submitted:             2012-07-16 12:40
Last Modified:              2012-07-16 12:40
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Summary:                    rdfxml-xmp output generates prohibited syntax
Description: 
When converting from Turtle to the XMP profile of RDF/XML, librdf generates
syntax which is prohibited by the XMP standard.  See below.

The rdfxml-xmp output contains the rdf:_1... properties which were included in
the input.  However, the XMP specification, ISO 16684-1:2011(E) (available at
<http://www.adobe.com/devnet/xmp.html>) says:

7.9.3.3	rdf:_n elements and attributes
RDF allows a sequence of rdf:li elements to be replaced with elements of the
form rdf:_1, rdf:_2, and so on. Because these are unique names,
element-to-attribute substitution similar to 7.9.2.2, “rdf:Description with
property attributes”, is also allowed in general RDF. The rdf:li element shall
be used in XMP and the rdf:_n form shall not be used in XMP.

I believe, therefore, that the rdfxml-xmp serialiser should translate rdf:_n
properties into rdf:li properties.

The workaround is to use rdf:li properties in the input.

Steps to Reproduce: 
% cat xmpinput.ttl 
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dc: <http://purl.org/dc/elements/1.1/>.

<> dc:creator [
    a rdf:Seq;
    rdf:_1 "First Author";
    rdf:_2 "Second Author" ].
% rapper -iturtle -ordfxml-xmp xmpinput.ttl
rapper: Parsing URI file:///checkouts/me/projects/mrd-gw/docs/jisc/xmpinput.ttl
with parser turtle
rapper: Serializing with serializer rdfxml-xmp
<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/'>
<rdf:RDF
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
  <rdf:Description rdf:about="">
    <dc:creator>
      <rdf:Seq>
        <rdf:_1>First Author</rdf:_1>
        <rdf:_2>Second Author</rdf:_2>
      </rdf:Seq>
    </dc:creator>
  </rdf:Description>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='r'?>
rapper: Parsing returned 4 triples
% rapper -v
2.0.7
% 

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Issue History 
Date Modified    Username       Field                    Change               
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2012-07-16 12:40 normang        New Issue                                    
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