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Carl: Another Rule Language

Carl is a tool for parsing N3 files and outputting the resulting triples in "N3P" format. "N3P" is a RDF/rules serialization format used by the Eye reasoner.

Build status

Build Status

Usage

carl [-b=base-uri] [-o=output-file] [input-files]

  • -b=baseUri the base URI to use when resolving relative URIs.
  • -o=output-file where the results are written, write to stdout when omitted.
  • input-files the Turtle input files to process, read from stdin when omitted.

Limitations

  • '@' keywords are not supported, with the exception of '@prefix' and '@base'.
  • The rules for matching terminal symbols do not follow the team submission, but are adapted to match the Turtle and SPARQL grammar terminals.
  • Variables are not allowed outside of graphs.
  • Literals, lists and graphs are not allowed as property.
  • Unlike N3, there is no implicit prefix definition for the default namespace (@prefix : <#>.).

Flex compilation issue

The N3Lexer.cc file included in the source tarball is generated with Flex version 2.5.35. If Flex installed on your system is newer, you might see compilation errors. In that case, you can execute make maintainer-clean src/N3Lexer.cc to regenerate N3Lexer.cc.