This is awesome! Excellent that you are maintaining this.

I like the language fine except there is one thing to add, [...]

White-space in Schemas [Wendell Piez]

Schema validation, including DTD validation, may provide for whitespace normalization on attributes (and in XSD, text content),
or at any rate specify it in such a way that in some parses
(schema-aware), they will be normalized (and hence may appear
differently from the data). So, a bit ouch. In XSLT they are left
alone, but given such a parse before the XSLT, they are not.

Also it's CDATA attributes not PCDATA attributes, am I wrong?