Templates not working for non-http IRIs

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#5 opened on Aug 10, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 55/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: java
Domain: data-engineering

Research direction

Start by running the minimal mapping example and tracing how rml:termType rml:IRI with rml:template is handled. Compare the HTTP, file, URN, and relative templates to find why only the HTTP result is emitted. Done means all four expected triples appear in the output.

Written by the indexing model from the issue text.

Description

When using rml:template to construct an IRI, explicitly indicated with rml:termType, the triples in question are missing from the output, except when they result in a well-formed HTTP URI.

Minimal example:

:mapping a rml:TriplesMap ;
  rml:logicalSource [
    # JSONPath root iterator over { "key": "value" }
  ] ;
  rml:subjectMap [ rml:termType rml:BlankNode ] ;
  rml:predicateObjectMap [
    rml:predicate <urn:example:http> ;
    rml:objectMap [
      rml:termType rml:IRI ;
      rml:template "http://example.org/{key}"
    ]
  ], [
    rml:predicate <urn:example:file> ;
    rml:objectMap [
      rml:termType rml:IRI ;
      rml:template "file:///example/{key}"
    ]
  ], [
    rml:predicate <urn:example:urn> ;
    rml:objectMap [
      rml:termType rml:IRI ;
      rml:template "urn:example:{key}"
    ]
  ], [
    rml:predicate <urn:example:relative> ;
    rml:objectMap [
      rml:termType rml:IRI ;
      rml:template "./{key}"
    ]
  ] .

Output:

_:Blank1 <urn:example:http> <http://example.org/value> .

Dominant language: Java
Stars: 3
Forks: 1
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