29.4 Document Type Definitions (cont.)
- Sequence of rules that describe:
- Legal attributes for each element type
- Legal child elements for each element type
- Legal child elements are described by an ELEMENT rule:
<!ELEMENT items (item*)>
items must contain 0 or more item elements
- Delimited by <!. . .>
- Contains element whose children are to be constrained
- Followed by description of children
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