Here is a list of all enum values with links to the classes they belong to:

### - u -

- UndeclaredElemInAttList : XMLErrs
- UndeclaredElemInCM : XMLErrs
- UndeclaredElemInDocType : XMLValid
- Unexpected2ndSurrogateChar : XMLErrs
- UnexpectedEOE : XMLErrs
- UnexpectedWhitespace : XMLErrs
- UniqueParticleAttributionFail : XMLValid
- UnKnown : XMLElementDecl, XMLNumber, XMLResourceIdentifier
- Unknown : XMLURL
- UnknownBaseDatatype : XMLValid
- UnknownComplexType : XMLErrs
- UnknownEntityRefAttr : XMLValid
- UnknownNotRefAttr : XMLValid
- UnknownPrefix : XMLErrs
- UnknownSimpleType : XMLErrs
- UNORDERED_NODE_ITERATOR_TYPE : DOMXPathResult
- UNORDERED_NODE_SNAPSHOT_TYPE : DOMXPathResult
- UnRep_CharRef : XMLFormatter
- UnRep_Fail : XMLFormatter
- UnRep_RepChar : XMLTranscoder
- UnRep_Replace : XMLFormatter
- UnRep_Throw : XMLTranscoder
- UnresolvedPrefix : XMLErrs
- UnspecifiedBase : XMLErrs
- UnsupportedEncoding : XMLTransService
- UnsupportedXMLVersion : XMLErrs
- UnterminatedCDATASection : XMLErrs
- UnterminatedCharRef : XMLErrs
- UnterminatedComment : XMLErrs
- UnterminatedContentModel : XMLErrs
- UnterminatedDOCTYPE : XMLErrs
- UnterminatedElementDecl : XMLErrs
- UnterminatedEndTag : XMLErrs
- UnterminatedEntityDecl : XMLErrs
- UnterminatedEntityLiteral : XMLErrs
- UnterminatedEntityRef : XMLErrs
- UnterminatedNotationDecl : XMLErrs
- UnterminatedPI : XMLErrs
- UnterminatedStartTag : XMLErrs
- UnterminatedXMLDecl : XMLErrs
- utc : XMLDateTime
- UTC_NEG : XMLDateTime
- UTC_POS : XMLDateTime
- UTC_STD : XMLDateTime
- UTC_UNKNOWN : XMLDateTime