XML value indicators lists the terms and symbols used to build the XML expressions with proper syntax structure.

Table 1. XML value indicators

Value indicator



Character data (CDATA) type attributes may contain only character data.


Parsed character data is text that will be examined by the parser for entities and proper syntax.


The asterisk (*) indicates that the content is optional (may occur zero or more times).


The question mark (?) after an element makes it optional, but only one may appear.