In a document type definition (DTD)file,a plus (+)symbol beside an element indicates that it is an optional child element within its parent.

Name: In a document type definition (DTD)file,a plus (+)symbol beside an element indicates that it is an optional child element within its parent.
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In a DTD, a plus (+) symbol indicates that the element must appear one or more times, not that it is optional. An optional element is indicated by a question mark (?) symbol.

In a Document Type Definition (DTD)file,a Plus (+)Symbol Beside an Element