From the pattern: "The Generated Text Pattern is used when text must be rendered but is not itself included
in the XML document. The markup must support the generation of the correct text at the correct place,
and may allow the text to be supplied in the document in order to override the automatic generation algorithm."
This pattern is from The XML Specification Guide Web site by Ian Graham and Liam Quin.
This is on of a group of documentation oriented design patterns presented at the site.