Sathasivam, Elayaraja wrote, On 2008-08-18 11:33:
I am new to XSL:key.
Could any one tell for the following,
1) <xsl:variable name="result" select="key($index,$key)"/> what it does
From XSLT 2.0: http://www.w3.org/TR/xslt20/#function-key
The result is a sequence containing every node $N that satisfies the
following conditions:
*
|$N/ancestor-or-self::node() intersect $top| is non-empty. (If the
third argument is omitted, |$top| defaults to |/|)
*
$N matches the pattern specified in the |match| attribute of an
|xsl:key| <http://www.w3.org/TR/xslt20/#element-key> declaration
whose |name| attribute matches the name specified in the
|$key-name| argument.
*
When the key specifier
<http://www.w3.org/TR/xslt20/#dt-key-specifier> of that |xsl:key|
<http://www.w3.org/TR/xslt20/#element-key> declaration is
evaluated with a singleton focus
<http://www.w3.org/TR/xslt20/#dt-singleton-focus> based on $N, the
atomized <http://www.w3.org/TR/xslt20/#dt-atomization> value of
the resulting sequence includes a value that compares equal to at
least one item in the atomized value of the sequence supplied as
|$key-value|, under the rules of the |eq| operator with the
collation selected as described above.
Somewhere you need an index declaration by using xsl:key tag, for example,
<xsl:key name="func" match="prototype" use="@name"/>
The $index in your question refer to the name of the index, in my example, the "func". The $key is matched against all nodes
that matches "prototype" and the value of the "@name" attribute is compared to the $key variable. All nodes whose @name attribute
matches the $key in an element that matched the pattern "prototype" are part of
the sequence
<a>
<prototype @name="1">
One
</protoype>
<prototype @name="2">
Two
</protoype>
<prototype @name="1">
Three
</protoype>
</a>
and the statement
<xsl:variable name="zz" select="key('func','1')"/> would set the variable zz to the two elements
prototype with text "One" and "Three".
The behavior in XSLT 1.0 is similar. See http://www.w3.org/TR/xslt#function-key.
2) To find long descripting, the existing xsl mapping for Type="PP" and
searching keyword for ZZ. Question: without specifying the attibue name
such as Pkey and Type....How it searching the output of LongDes as ZO
Contracts ???
I do not understand the question. Do you want to search all elements
with an attribute "LongDes" that matches the value "ZO Contracts"?
From the exising Input xml file,
<Document>
<Legend>
<TypeDesc Type="PP" Id="1" PKey="ZZ" xml:lang="EN" ShDes="ZZ"
LongDes="ZO Contracts"/>
</Legend>
</Document>
Requirement: To find LongDes
Exising XSL file:
<xsl:call-template name="getLegend">
<xsl:with-param name="cat" select="'PP'"/>
<xsl:with-param name="key" select="'ZZ'"/>
</xsl:call-template>
<xsl:template name="getLegend">
<xsl:param name="cat"/>
<xsl:param name="key"/>
<xsl:call-template name="lookup">
<xsl:with-param name="index" select="'legendIndex'"/>
<xsl:with-param name="key"
select="concat($cat,'_',$key)"/>
<xsl:with-param name="doc" select="$legend"/>
<xsl:with-param name="expr" select="'@LongDes'"/>
</xsl:call-template>
</xsl:template>
<xxsl:template name="lookup">
<!-- index name, i.e. name of the key -->
<xsl:param name="index"/>
<xsl:param name="key"/>
<!-- default value -->
<xsl:param name="default" select="''"/>
<!-- node in index source document, per default default value
-->
<xsl:param name="doc" select="$default"/>
<!--expr to evaluate to return value, per default result node
-->
<xsl:param name="expr" select="'.'"/>
<!-- force context to document where the lookup table is -->
<xsl:for-each select="$doc[1]">
<xsl:variable name="result" select="key($index,$key)"/>
<xsl:choose>
<xsl:when test="$result">
<xsl:value-of
select="xalan:evaluate(concat('$result[1]/',$expr))"/>
</xsl:when>
<xsl:when test="$default">
<xsl:value-of select="$default"/>
</xsl:when>
</xsl:choose>
</xsl:for-each>
</xsl:template>
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