xml.fileAssociations property does not work with DTD files

[amasino]

Adding a file association in settings.json using a DTD like the following:

[{"systemId": "http://w3.atsec/cctool/dtd/my-grammar.dtd",
"pattern": "ase_*.xml"}]

does not work.

The extension successfully matches the xml file (I set "xml.validation.noGrammar": "error" and there is no error when opening the file) but neither is the DTD existence verified nor the grammar is checked.

[angelozerr]

Indeed the xml file associations doesn't work with DTD. It works only with XSD. It's a limitation of Xerces, I created a bug for that https://issues.apache.org/jira/browse/XERCESJ-1711?filter=-2