These datatypes
are lists of whitespace-separated items.
The type of these items (called the item type) is defined during the
derivation process (which we will see in the next chapter) and list
datatypes can be derived from any simple type. Three predefined
datatypes are lists (
xs:NMTOKENS ,
xs:IDREFS , and
xs:ENTITIES ). For all
the list datatypes, the items must be separated by one or more
whitespaces.
xs:NMTOKENS
This is a
whitespace-separated list of
xs:NMTOKEN . Each item
of the list must be in the lexical space of
xs:NMTOKEN .
xs:IDREFS
This is a
whitespace-separated list of
xs:IDREF . Each item
of the list must be in the lexical space of
xs:IDREF and must reference an existing
xs:ID in the same document.
xs:ENTITIES
This is a
whitespace-separated list of
xs:ENTITY . Each item
of the list must be in the lexical space of
xs:ENTITY and must match an unparsed entity defined in a
DTD.