While trying to move RDF data between systems, we have found that TopBraid
appears to use a non-standard way to specify the base URI in its Turtle
mode.
The documentation is clear: on the Help page
TopBraid Composer > RDF and TopBraid > Named Graphs and Base URIs in
TopBraid
it says
base URI that identifies a graph is saved within a file using one of the
following types of statements:
- For RDF/XML serialization:
xml:base="http://www.example.org/myExample/baseURI";
- For Turtle and N-Triple serializations:
# baseURI: http://www.example.org/myExample/baseURI
This RDF/XML form conforms with the RDF/XML spec - see
http://www.w3.org/TR/2003/PR-rdf-syntax-grammar-20031215/#section-Syntax-ID-xml-base
which recycles the xml:base tag from the XML Base standard:
http://www.w3.org/TR/xmlbase/
However, the Turtle form seems to be rather non-standard, smuggling the
base URI through to TopBraid in a comment, and not using the @base
directive provided by
Turtle http://www.w3.org/TeamSubmission/turtle/#sec-uris .
TopBraid's non-conformant usage here appears to be causing some challenges
in moving data between systems.
As the Help page continues:
Graphs created outside of TopBraid must take care to follow the rules
specified above.
Could this non-standard requirement be avoided by using the standard
directive instead?
Simon
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