> xerces 12.0 supports it, but has lacks with big documents
The latest version of Xerces-J is 2.12.0. I agree, that while using XSD 1.1 <assert> (assuming you're referring to <assert>) it doesn't scale when using super huge input XML documents. I guess, <assert> would have similar problems with other XSD 1.1 processors. For large input documents, its best not to write <assert> near the root of the input document. Using <assert> for smaller 'sub documents' within large documents works well.
> support is not included in main distro, so you must re-compile it
by yourself.
, binary distributions of Xerces-J are available as well. There are two binary distributions available as following (Pls see section 'Binary Distributions'):
