An XML attribute can be described through a DTD schema by:
<!ATTLIST price euro CDATA> A DTD schema for an XML element price with an attribute euro of type CDATA.
<!ATTLIST chair occupied CDATA "false">A DTD schema for an XML element char with attribute occupied which defaults to false.
Other value specifications are:
#REQUIRED→ this attribute must exist on the element#IMPLIED→ this attribute does not have to exist on the element#FIXED {value}→ this attribute must have a value that is always identical to{value}