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   Re: XML Formal Public Identifier

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  • From: Paul Grosso <paul@arbortext.com>
  • To: xml-dev@ic.ac.uk
  • Date: Tue, 9 Jun 1998 12:22:50 -0400

At 13:21 1998 06 08 -0400, Tim Bray wrote:
>At 01:12 PM 6/8/98 -0400, Daniel Pitti wrote:
>>Is there an official (W3C) Formal Public Identifier for XML? And notation
>No.  XML 1.0 does not support FPIs. -Tim

I'm not sure how Tim is using "support" in this case.

In the XML Rec, production 12 [1] is for PubidLiteral which is described
in the XML Rec [2] as follows:

  In addition to a system identifier, an external identifier may 
  include a public identifier. 

All FPIs are public identifiers (the set of FPIs is a subset of the
set of public identifiers).

Finally, whether or not you consider this "support" of FPIs, the original
question is not unreasonable; the W3C could still opt to define an FPI for
the XML Rec so that people could write a notation declaration such as:


(Note that XML notation declarations [3] do not require a system identifier
as external identifiers for entity declarations do.)

I am not aware of this issue being raised before, so I believe the current
answer to the question is "no, there is no official FPI for XML," but I see
no technical reason there couldn't be.

[1]  http://www.w3.org/TR/REC-xml.html#NT-PubidLiteral
[2]  http://www.w3.org/TR/REC-xml.html#sec-external-ent
[3]  http://www.w3.org/TR/REC-xml.html#dt-notation

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