Hi all,
What does something like [/a/b] mean in an XPath query like /c/d[/a/
b] ?
If I am not wrong, /c/d[./a/b] means return all d elements that their
parent is c and their grand parent is the root element and have a
child that is a and their a child has a child b. But I don't know when
we don't use an expression that starts with ./ or .// in a predicate
and instead use an epxression that starts with / or // what it would
mean.
Does /c/d[/a], for example, mean return all d elements that have a
parent (c with a parent root) only if the root has a child a?
Thanks in advance.
5  2704 
Altu schrieb:
Does /c/d[/a], for example, mean return all d elements that have a
parent (c with a parent root) only if the root has a child a?
Yes, but the root is either c or a. So the XPath expression does not
select anything.
--
Johannes Koch
Spem in alium nunquam habui praeter in te, Deus Israel.
(Thomas Tallis, 40-part motet)
Johannes Koch schrieb:
Altu schrieb:
>Does /c/d[/a], for example, mean return all d elements that have a
parent (c with a parent root) only if the root has a child a?
Yes, but the root is either c or a.
I mean the root _element_.
So the XPath expression does not
select anything.
--
Johannes Koch
Spem in alium nunquam habui praeter in te, Deus Israel.
(Thomas Tallis, 40-part motet)
Hi Johannes,
Thanks for the reply. Also what is the meaning of multiple consequtive
filters like
a[p1][p2][p2]
Does it mean a elements that satisfy p1 AND p2 and p3?
-Al
On Oct 6, 7:04 pm, Johannes Koch <k...@w3develop ment.dewrote:
Johannes Koch schrieb:
Altu schrieb:
Does /c/d[/a], for example, mean return all d elements that have a
parent (c with a parent root) only if the root has a child a?
Yes, but the root is either c or a.
I mean the root _element_.
So the XPath expression does not
select anything.
--
Johannes Koch
Spem in alium nunquam habui praeter in te, Deus Israel.
(Thomas Tallis, 40-part motet)
Altu wrote:
Thanks for the reply. Also what is the meaning of multiple consequtive
filters like
a[p1][p2][p2]
Does it mean a elements that satisfy p1 AND p2 and p3?
Exactly. By the way, the proper term is "predicates ", not filters.
--
() ASCII Ribbon Campaign | Joe Kesselman
/\ Stamp out HTML e-mail! | System architexture and kinetic poetry
In article <47************ ***********@aut hen.yellow.read freenews.net>,
Johannes Koch <ko**@w3develop ment.dewrote:
>>Does /c/d[/a], for example, mean return all d elements that have a
parent (c with a parent root) only if the root has a child a?
>Yes, but the root is either c or a.
The root node has exactly one element child, which is the root element.
You can only have /c/d if the root element is c, and [/a] will only
be true if the root element is a, so it will never succeed.
-- Richard
--
"Considerat ion shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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