Missing rdf namespace

[s0301132]

Hi @gtfierro, when I use make.py to convert, the ttl file are missing rdf namespace even I put it in template txt, the output ttl file only have brick and building namespace.

[gtfierro]

The RDFlib serialization I believe will skip any namespaces that aren't used in the output. Statements like bldg:x a brick:Sensor technically use the rdf namespace (a is an alias for rdf:type), but this gets factored out during the export process. Does this match what you are seeing, or are there triples with rdf:**** in the output TTL file?

[s0301132]

@gtfierro yes, the output ttl file use something like bldg:x a brick:Sensor instead of rdf:type, in my template.txt I use rdf like wkgo:$3 rdf:type brick:Main_Header_Pipe but the output still missing rdf namespace.

[gtfierro]

Sounds like this is the RDFlib serialization implementation; the a token is part of the Turtle spec so this is technically valid output. Any compliant turtle file parser should be able to parse the output file correctly and recognize a as rdf:type

[s0301132]

That's OK since the builder can convert rdf:type to a, may be I need to add the rdf namespace in GraphDB.

[gtfierro]

I think adding the rdf namespace to GraphDB is a good idea. However, to be clear, a is equivalent to rdf:type (no conversion is performed), and this is done by RDFlib, not by brick-builder. Are you running into any issues with the TTL files produced by brick-builder?

[s0301132]

Thanks @gtfierro, there are no issue whille converting, knowing the rdf namespace is not a issue by brick-builder and everything is fine. Thanks!