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   Specification Questions

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  • From: "Neil Bradley" <neil@bradley.co.uk>
  • To: xml-dev@ic.ac.uk
  • Date: Wed, 30 Jul 1997 19:43:52 +0000

While studying the June 30 version of the XML standard, I noted 
a small number of possible discrepancies and gaps.

The symbols [6]Names and [8]Nmtokens do not appear to be used in any
other rule. Are they redundant?

The symbol [40]elementdecl consists of the following expression:

   '<!ELEMENT' S %Name S (%S S)? %contentspec S? '>'

What is the purpose of the '(%S S)?' part of this rule? 

The second line of the rule for [50]Mixed is:

   |  '(' S? %( '#PCDATA' ) S? ')'

I cannot understand the purpose of the inner brackets in this part of
the rule.

There is also little written about interpretation of line-ending
codes. Although the standard states that white space and line-ending
codes are ignored in element content, nothing is said regarding the
age old problem of line-ending codes in mixed content. For example, in
SGML we know that an initial and final record end is ignored, so:

Here is a paragraph.

is considered the same as:

<P>Here is a paragraph.</P>

Could we have some clarifications on this point?



Neil Bradley - Author of The Concise SGML Companion.

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