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A Few Final Notes

Now that you are ready to start writing SGML declarations, there are a few additional items to keep in mind:

• SGML declarations are always encoded using the reference concrete syntax, which means the keywords, delimiters, quantities, etc. used in the SGML declaration cannot be changed.
• The only data characters allowed without the use of numeric character references are minimum data characters (basically alpha-numerics, a few special characters, RE, RS and SPACE). One character that would be useful but that is not valid is the backslash used in MS-DOS directory specifications.
• Entity references are not allowed (how would you declare them), although external entities may be referenced in a few, defined cases using public identifiers.

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