Built-in Simple Type (Strings)

stringcharacter string
normalized stringline breaks are normalized
tokenwhitespace is normalized
NMTOKENshould not contain whitespace (attribute only)
NMTOKENSList of NMTOKENs (attribute only)
Namenot starting with a digit
NCNamecannot contain colons
IDunique identification in document (attribute only)
IDREFreference to ID field in document (attribute only)
IDREFSlist of references to ID fields in document (attribute only)
ENTITYreference to entity (attribute only)
ENTITIESlist of references to entities (attribute only)
languagelanguage codes