Attributes supply additional information about an element. For example, the DTD designer for a manual could use an attribute called version for its book element to allow the user to specify a book’s revision status. In FrameMaker, the attributes for an element are a part of the definition of the element itself. In XML or SGML, the attributes of an element occur separately in an attribute defini­tion list declaration (ATTLIST) in the DTD.

Attributes can have a default value or a fixed value. Attributes can also be either mandatory or optional. For example, if you have a topic element, the topic ID could be a mandatory attribute for topics being cross-referenced. You can also have value ranges for attributes or enumerate the legal values for an attribute.

September 30, 2016

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