XML DTDLesson 77Free preview

DTD Elements

This lesson is part of XML · All levels

Summary

The DTD element declaration is <!ELEMENT content name>, where the content can be EMPTY, ANY, #PCDATA, or a child list with operator, + *? The comma sign means mandatory order, the pipe sign means choice of one, and the?*+ sign sets the number of appearances. This pattern is similar to a regular expression for XML structures.

Key points

Empty = no content; ANY = text or free child; #PCDATA = text only
(to,from) means to then from in sequence
(to choose from) means one
Operator? = zero or one, * = zero or more, + = one or more
Mixed content is written as (#PCDATA}}

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