Pergunta

Apart from whitespace, quotation mark, equal sign, and tab, which other characters of the printable subset of ASCII are forbidden to be used as attribute names in SGML?

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Solução

By default, SGML allows only alphanumeric values for SGML names. What additional characters are allowed for SGML names is controlled by the SGML declaration; specifically UCNMCHAR and LCNMCHAR under NAMING.

For example, if you look at the SGML declaration for HTML 4, you'll see:

LCNMCHAR ".-_:"    
UCNMCHAR ".-_:"

This means that the characters ., -, _, and : are also allowed in SGML names (element/attribute/entity/etc).

NOTE: Only a letter is allowed as the first character of an SGML name.

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