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   Re: Naming Rules

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  • From: Chris Maden <crism@oreilly.com>
  • To: xml-dev@ic.ac.uk
  • Date: Mon, 27 Jul 1998 14:32:51 -0400 (EDT)

[Christina Portillo]
> I need some clarification on the differences in the naming rules
> defined in the XML SGML Declaration and the Naming Rules defined in
> XML Part 1 Names and Tokens.


> My understanding of the Name restricts the 1st character position to
> a letter or a underscore or colon which is in sync with the SGML
> Declaration. But the NameChar allows underscores and colons in the
> remaining character positions which is at variance with the naming
> rules defined by the SGML Declaration.
> Can you clarify this for me?

Characters defined as NAMESTRT, LCNMSTRT, or UCNMSTRT are usable as
name characters; that is, name start characters are a strict subset of
name characters, and so definition as the former implies definition as
the latter.

The relevant productions from ISO 8879 are:

   [52] name character =
          name start character |
          Digit |
          LCNMCHAR |
   [53] name start character =
          LC Letter |
          UC Letter |
          LCNMSTRT |

(See <URL:http://www.oreilly.com/people/staff/crism/sgmldefs.html>.)

Note that this information is not necessary to understand the XML
Recommendation; the name productions in REC-XML are correct as they

<!ENTITY crism PUBLIC "-//O'Reilly//NONSGML Christopher R. Maden//EN"
"<URL>http://www.oreilly.com/people/staff/crism/ <TEL>+1.617.499.7487
<USMAIL>90 Sherman Street, Cambridge, MA 02140 USA" NDATA SGML.Geek>

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  • References:
    • Naming Rules
      • From: "Portillo, Christina" <Alice.Portillo@PSS.Boeing.com>


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