[RDF/XML] Improve namespace declarations

[lemoinet]

This can be simpliffied

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rdf:RDF [

<!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
<!ENTITY rdfs 'http://www.w3.org/2000/01/rdf-schema#'>
<!ENTITY xsd 'http://www.w3.org/2001/XMLSchema#'>
<!ENTITY bsdd 'http://bsdd.buildingsmart.org/def#'>
<!ENTITY qudtUnit 'http://qudt.org/vocab/unit/'>
<!ENTITY pdt1_0 'https://identifier.buildingsmart.org/uri/pdt/pdt/1.0'>
]>
<rdf:RDF xml:base="https://identifier.buildingsmart.org/uri/pdt/pdt/1.0/class/suspendedceilingkit" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns:bsdd="http://bsdd.buildingsmart.org/def#" xmlns:qudtUnit="http://qudt.org/vocab/unit/" xmlns:pdt1_0="https://identifier.buildingsmart.org/uri/pdt/pdt/1.0" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

to this:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rdf:RDF [

<!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
<!ENTITY rdfs 'http://www.w3.org/2000/01/rdf-schema#'>
<!ENTITY xsd 'http://www.w3.org/2001/XMLSchema#'>
<!ENTITY bsdd 'http://bsdd.buildingsmart.org/def#'>
<!ENTITY qudtUnit 'http://qudt.org/vocab/unit/'>
<!ENTITY pdt1_0 'https://identifier.buildingsmart.org/uri/pdt/pdt/1.0'>
]>
<rdf:RDF xml:base="https://identifier.buildingsmart.org/uri/pdt/pdt/1.0/class/suspendedceilingkit" xmlns:rdfs="&rdfs;" xmlns:xsd="&xsd;" xmlns:bsdd="&bsdd;" xmlns:qudtUnit="&qudtUnit;" xmlns:pdt1_0="&pdt1_0;" xmlns:rdf="&rdf;">

[atomczak]

Thanks, we will consider it.

[Baars-IT]

We're using library dotNetRDF for generating the RDF output. As it is just a very small improvement we'll just use what this library delivers.