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Re: Why is < illegal in an attribute value but theequivalent h

  • From: Pete Cordell <pete++xmldev@codalogic.com>
  • To: Roger L Costello <costello@mitre.org>,"xml-dev@l..." <xml-dev@l...>
  • Date: Thu, 17 Mar 2022 12:23:36 +0000

Re:  Why is < illegal in an attribute value but theequivalent h
On 17/03/2022 11:57, Roger L Costello wrote:
Thanks Pete. That makes sense.

And to be sure that I am crystal clear, when you say:

Internal logic converts "&#x3C;x>blah&#x3C;/x>" to "<x>blah</x>"

The resulting converted value:

     "<x>blah</x>"

does _not_ mean there is an element <x> with value blah. Rather, it means there is a stream of characters '<', 'x', '>', 'b', 'l', 'a', 'h', '<', '/', 'x', '>'  and those characters have no semantics and are not to be interpreted.

Correct?
Correct. At the XML parsing level an attribute value of "<x>blah</x>" has no more semantic value than an attribute value of "Roger".

(Naturally, to be pedantic, higher levels could associate domain specific semantics with either of those values - like your ET and EX attribute values posted earlier - but as far as XML parsing is concerned, the job is done :) )

Regards,

Pete.
--
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Pete Cordell
Codalogic Ltd
Read & write XML in C++, http://www.xml2cpp.com
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