Not sure if this belongs here or in java-stix-validator, so sorry if I posted in the wrong place.

If I define a custom ControlledVocabularyType extension as described here and then attempt to validate an instance document which leverages that controlled vocabulary, I get the following error in java-stix-validator:

SAXParseException:
    Public ID: null
    System ID: null
    Line     : 3
    Column   : 70
    Message  : cvc-elt.4.2: Cannot resolve 'customVocabs:CustomVocab-1.0' to a type definition for element 'stix:Package_Intent'.

It would be nice to provide a function which makes it easy to pass in a directory of schemas to validate a STIX document against and support the validation of third-party extensions.