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Re: XPath and XPattern (was Re: More on taming SAX)

• To: Jeff Rafter <lists@j...>
• Subject: Re: XPath and XPattern (was Re: More on taming SAX)
• From: Christian Nentwich <christian@s...>
• Date: Sat, 25 Dec 2004 15:24:28 +0000
• Cc: Uche Ogbuji <Uche.Ogbuji@f...>, xml-dev@l...
• In-reply-to: <41CC35BF.8060006@j...>
• Organization: Systemwire
• References: <E1ChXnb-0004PJ-00@u...><41CB29FA.8010201@t...> <2295385071.20041223225022@s...><1103866336.16585.28.camel@borgia> <133339205762.20041224110042@s...><41CC35BF.8060006@j...>
• Reply-to: Christian Nentwich <christian@s...>

Jeff,

<snip/>

> But when considering /foo/bar[baz3="test"]/baz1
> <foo>
>    <bar>
>      <baz1/>
>      <baz2/>
>      <baz3>test</baz3>
>    </bar>
> </foo>
> This predicate's value cannot be ascertained at the point of the baz1
> startElement event in a single event look ahead model. At least that is
> what I heard through the grapevine.

That is correct. The earlier drafts of STXPath disallowed the child
axis in predicates, allowing only ancestor:: and parent::. I don't
know when this was changed, or what the rationale is.. or whether it
is enforced through a static semantic constraint to simplify the
grammar. I vaguely remember something about user convenience, and
making sure people don't have to write backwards paths (because an
absolute path starting with / can be matched in a predicate).

Christian

• References:
  • RE: XPath and XPattern (was Re: More on taming SAX)
    • From: "Michael Kay" <mike@s...>
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Oleg Tkachenko <oleg@t...>
  • Re: XPath and XPattern (was Re: More on taming SAX)
    • From: Christian Nentwich <christian@s...>
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Uche Ogbuji <Uche.Ogbuji@f...>
  • Re: XPath and XPattern (was Re: More on taming SAX)
    • From: Christian Nentwich <christian@s...>
  • Re: XPath and XPattern (was Re: More on tamingSAX)
    • From: Jeff Rafter <lists@j...>

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