Is there an XQuery existence function?

[Oliver Wong]

Is there a function (or other construct) which will return true if a certain
XPath points to an existing element, and false otherwise? E.g.

exists(./foo/bar)

would return true if there exists a foo/bar element which is the child of
the current context node, and false otherwise.

- Oliver

 

[Martin Honnen]

Is there a function (or other construct) which will return true if a certain
XPath points to an existing element, and false otherwise? E.g.

exists(./foo/bar)

would return true if there exists a foo/bar element which is the child of
the current context node, and false otherwise.

If you use a path yielding a node set respectively node sequence in a
boolean context then the result is true if there is at least one node in
the sequence and false otherwise meaning you can simply do e.g.
<xsl:if test="./foo/bar">
in XSLT or e.g.
if (./foo/bar) then
in XQuery.

 

[Philippe Poulard]

hi,

Is there a function (or other construct) which will return true if a certain
XPath points to an existing element, and false otherwise? E.g.

exists(./foo/bar)

try this :
boolean(foo/bar)

would return true if there exists a foo/bar element which is the child of
the current context node, and false otherwise.

- Oliver

--
Cordialement,

///
(. .)
--------ooO--(_)--Ooo--------
| Philippe Poulard |
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Have the RefleX !