Error Codes

XSLT 3.0 allows for the use of an @error-code attribute on xsl:message elements. This wiki page lists error coditions of ATOP and assigns error codes.

Error condition	Error code	Reference
It is an error if a moduleRef has an @except and an @include attribute		https://tei-c.org/release/doc/tei-p5-doc/en/html/ref-moduleRef.html
It is an error if the @source attribute contains a URI with an unknown scheme.		https://tei-c.org/release/doc/tei-p5-doc/en/html/TD.html#TDbuild