(child1,child2,..., child_n) |
Declares that an element has a sequence of child elements.
The following example indicates that the mail element has four child elements to, from, subject, and text that must appear in the order specified within the parentheses:
<!ELEMENT mail (to, from, subject, text)>
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(child1|child2|...|child_n) |
Declares that an element can have any one of the child elements among the elements separated by the “|” symbol. The following example indicates an element called mail that can contain any one of the specified child elements to, from, subject, or text:
<!ELEMENT mail (to | from | subject | text)> |
ANY |
Declares that any data is allowed within the element. This data can be text, child elements, or both. The following example indicates an element called UNIVERSAL_SET, which can contain any combination of text and child elements:
<!ELEMENT UNIVERSAL_SET ANY>
|