Name
Element Valid
Text from specification
An element is valid if there is a declaration
matching elementdecl where
the Name matches the element
type and either the declaration matches EMPTY and the element has no content,
or the declaration matches children and the sequence of child
elements belongs to the language generated by the regular
expression in the content model, with optional whitespace
(characters matching the nonterminal S) between the start-tag and the first
child element, between child elements, or between the last child
element and the end-tag. Note that a CDATA section containing only
whitespace does not match the nonterminal S, and hence cannot appear in these
positions. The declaration matches Mixed and the content consists of
character data and child elements whose types match names in the
content model. The declaration matches ANY, and the types of any child
elements have been declared.
Explanation
If a document includes a DTD with element declarations, make sure the actual elements in the document match the rules set down in the DTD.
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