Thanks. I found this reference in the XSLT
Programmer's Reference, should have paid more
attention when reading :(
Xiaocun
--- Michael Kay <mhk(_at_)mhk(_dot_)me(_dot_)uk> wrote:
When you apply string() to a node-set containing
more than one node it
returns the string value of the first node in the
node-set.
Michael Kay
# -----Original Message-----
# From: Xiaocun Xu [mailto:xiaocunxu(_at_)yahoo(_dot_)com]
# Sent: 24 March 2004 16:42
# To: xsl-list
# Subject: [xsl] xsl:key use attribute using
string() causes
# missing all matches except the first one
#
# Hi,
#
# I recently had an interesting discovery with
xsl:key use
# attribute using string().
# I been using string() in xsl:key use attribute
extensively
# since it allows me to retrieve records using the
key value
# "". But in the following example, using string()
caused me
# to miss all matches except the first one. I am
not sure what
# is the reason for this, would appreciate if anyone
could shed
# light on this behavior. Example input XML and
XSLT below.
#
# thanks,
# Xiaocun
#
# input XML:
# <range>
# <row row="16">
# <cell column="1">supplier</cell>
# <cell column="2">s3</cell>
# <cell column="3">item</cell>
# <cell column="4">
# <subcell>item1</subcell>
# <subcell>item2</subcell>
# <subcell>item3</subcell>
# </cell>
# <cell column="5">s3_AM1</cell>
# <cell column="6">accepted</cell>
# </row>
# <row row="17">
# <cell column="1">supplier</cell>
# <cell column="2">s4</cell>
# <cell column="3">item</cell>
# <cell column="4">
# <subcell>item1</subcell>
# <subcell>item2</subcell>
# <subcell>item4</subcell>
# </cell>
# <cell column="5">s4_AM1</cell>
# <cell column="6">accepted</cell>
# </row>
# <row row="18">
# <cell column="1">supplier</cell>
# <cell column="2">s5</cell>
# <cell column="3">item</cell>
# <cell column="4">item1</cell>
# <cell column="5">s5_AM1</cell>
# <cell column="6">accepted</cell>
# </row>
# </range>
#
# complete XSLT without using string():
# <xsl:stylesheet version="1.0"
# xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
# xmlns:fo="http://www.w3.org/1999/XSL/Format";>
# <xsl:key name="itemInvitesKey"
# match="//row[cell[(_at_)column=3] = 'item']"
# use="cell[(_at_)column=4]"/>
# <xsl:key name="itemInvitesKey"
# match="//row[cell[(_at_)column=3] = 'item']"
# use="(cell[(_at_)column=4]/subcell)"/>
# <xsl:template match="/">
# <xsl:apply-templates select="range"/>
# </xsl:template>
# <xsl:template match="range">
# <xsl:text>item1
</xsl:text>
# <xsl:for-each select="key('itemInvitesKey',
'item1')">
# <xsl:value-of select="cell[(_at_)column=2]"/>
# <xsl:text>
</xsl:text>
# </xsl:for-each>
# <xsl:text>
</xsl:text>
# <xsl:text>item2
</xsl:text>
# <xsl:for-each select="key('itemInvitesKey',
'item2')">
# <xsl:value-of select="cell[(_at_)column=2]"/>
# <xsl:text>
</xsl:text>
# </xsl:for-each>
# </xsl:template>
# </xsl:stylesheet>
#
# correct output:
# item1
# s5
# s3
# s4
#
# item2
# s3
# s4
#
# Exact same XSLT as above, except xsl:key use
attribute using string():
# <xsl:key name="itemInvitesKey"
# match="//row[cell[(_at_)column=3] = 'item']"
# use="string(cell[(_at_)column=4]/subcell)"/>
#
# Output: same as above, except no matches were
returned except
# for the first key (item1)
# item1
# s5
# s3
# s4
#
# item2
#
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