appears they are not currently exposing any XML functions besides:

Add remaining SQL/XML functions ------------------------------- Key: TEIIDDES-2408 URL: https://issues.jboss.org/browse/TEIIDDES-2408 Project: Teiid Designer Issue Type: Task Components: Patch Release, Teiid Integration Reporter: Steven Hawkins Assignee: Barry LaFond Fix For: 10.0.1, 9.2.1 Teiid added support for: XMLTEXT - just a regular function XMLEXISTS - a predicate with syntax similar to XMLQUERY XMLCAST - similar to CAST All are in the documentation and match the sql standard - https://docs.jboss.org/author/display/TEIID/XML+Functions