Traditional IDs, such as Social Security numbers or ISBNs, are commonly declared as ID attributes in DTDs.

Name: Traditional IDs, such as Social Security numbers or ISBNs, are commonly declared as ID attributes in DTDs.
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Traditional IDs like Social Security numbers or ISBNs are not typically declared as ID attributes in DTDs because ID attributes in DTDs must be unique within the document, whereas these traditional IDs may not be unique in that context.

Traditional IDs, Such as Social Security Numbers or ISBNs, Are