At 03:13 PM 1/21/2005, you wrote:
Ok, but that's not the case when using variable. And i change that to
<xsl:value-of
select="document('connections.xml')/connections/connection[(_at_)id=(_dot_)/Conn]"/>
but it still doen´t work the way i expected...
Antonio,
What you're missing is the concept of the "context node" for evaluating the
expression.
The expression "Conn" is short for "child::Conn".
The expression "./Conn" is short for "self::node()/child::Conn".
In the example provided, the context node for the expression "@id=Conn" or
"@id=./Conn" is the same -- as Mike said, the connection. (The context node
for a predicate is each of the nodes being predicated.) Both of these
expressions return the same thing when the context is the same.
When you use a variable, you have already bound your Conn child to the
variable when the expression is evaluated, so the context node is not a
concern. Note that where you bind your variable does matter.
If you did extra work to do the same thing, and said
<xsl:for-each select="document('connections.xml')/connections/connection">
<xsl:variable name="conn" select="Conn"/>
<xsl:if test="@id = $conn">
<xsl:value-of select="."/>
</xsl:if>
</xsl:for-each>
it wouldn't work. (Nor would you, an XSLT expert, expect it to.) But this
would:
<xsl:variable name="conn" select="Conn"/>
<xsl:for-each select="document('connections.xml')/connections/connection">
<xsl:if test="@id = $conn">
<xsl:value-of select="."/>
</xsl:if>
</xsl:for-each>
Right? (And this is the better analogue to what you're doing when your
predicate has "@id=$conn")
The short answer: you probably want your predicate to read
"@id=current()/Conn", though without seeing the rest of the logic it's
impossible to be certain. Or just use the variable: we do this all the time.
Cheers,
Wendell
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Wendell Piez
mailto:wapiez(_at_)mulberrytech(_dot_)com
Mulberry Technologies, Inc. http://www.mulberrytech.com
17 West Jefferson Street Direct Phone: 301/315-9635
Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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