[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message]

Re: Collection-Valued Subexpressions?

• To: xml-dev@l...
• Subject: Re: Collection-Valued Subexpressions?
• From: Alan Gutierrez <alan-xml-dev@e...>
• Date: Sun, 28 Aug 2005 13:06:41 -0400
• In-reply-to: <20050828170259.GP19112@m...>
• Mail-followup-to: xml-dev@l...
• References: <20050828170259.GP19112@m...>
• User-agent: Mutt/1.4.1i

* Alan Gutierrez <alan-xml-dev@e...> [2005-08-28 13:02]:
>     I'm reading through the XPath 2.0 Requirements.
> 
>     "In XPath 1.0, the use of a collection-valued subexpression can
>         introduce an implicit existential quantification or
>         choose-first-member operation into the containing
>         expression's semantics."
> 
>     The problem with XPath 1.0 appears to be that:
> 
>         /a[b = 5] 
> 
>     Returns all matches while.. 
> 
>         /a[b + 1 = 6]
> 
>     .. returns only the first match.
> 
>     The fix in XPath 2.0 appears to be to return an error for the
>     latter if there is more than one match.

    Correction: .. if there is more than one b element.

>     Why is it not possible to return all /a[b + 1 = 6] ?

    I kinda see the meaning of "implicit existential
    quantification". Does that mean, you have to have a b element in
    order to add 1 to it's value?

--
Alan Gutierrez - alan@e...
    - http://engrm.com/blogometer/index.html
    - http://engrm.com/blogometer/rss.2.0.xml

• Follow-Ups:
  • Re: Re: Collection-Valued Subexpressions?
    • From: David Carlisle <davidc@n...>

• References:
  • Collection-Valued Subexpressions?
    • From: Alan Gutierrez <alan-xml-dev@e...>

• Prev by Date: Collection-Valued Subexpressions?
• Next by Date: RE: Collection-Valued Subexpressions?
• Previous by thread: Collection-Valued Subexpressions?
• Next by thread: Re: Re: Collection-Valued Subexpressions?
• Index(es):
  • Date
  • Thread