An RDFa 1.1. implementation for browsers.
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Green Turtle

An RDFa 1.1 implementation in JavaScript for browsers.

Note: This project has transitioned from its former Google Code project.


Green Turtle passes all the tests for XML, XHTML1, XHTML5, HTML4, and HTML5 as provided by the RDFa WG except for the following notable issues:

  • XML Test 0332 uses a bare lang attribute instead of an xml:lang attribute. I believe this is a bug in the test. Green Turtle does the right thing with respect to xml:lang attributes in XML and lang attributes in HTML. A lang attribute in arbitrary XML has no special meaning.
  • XHTML1 Test 0198 and XHTML5 Test 0198 both have extra namespaces serialized in the XMLLiteral as expected output. The input for the test cases does not have XML namespace attributes. Instead, they use a prefix attribute to declare the prefixes used in the RDFa annotations. Meanwhile, when the literal is serialized, they are not in the in-scope namespaces. The RDFa specification says nothing about doing any kind of merging of prefixes and in-scope namespaces. I believe these test cases are incorrect. The correct serialization will not contain the rdf: and foaf: namespace declarations as they are not present in the source document.

I have submitted these issue to the working group for consideration.

Test Suite

To run the tests yourself, you will need Java and Ant installed and then do the following:

  1. Build Green Turtle by running ant in the root directory.

  2. Build the SPARQL service:

    cd tests/sparql-service/
     cd ../..
  3. Cache the test cases:

    cd tests/harness
  4. Run the server:

    ../server/ web.xml
  5. Visit http://localhost:8888/ in your browser.

  6. Select the markup language from the drop-down list box and hit the 'Test' button. The system will run the test cases rather silently unless you look at the console. Eventually, it will output a table of the status of all the test cases.