Happy New Year and Best Wishes to Everyone !
On Sat, Jan 3, 2009 at 10:38 AM, Richard Lewis
<richard(_dot_)lewis(_at_)gold(_dot_)ac(_dot_)uk> wrote:
Hi there,
I'm trying to make a tree-hierarchic document from a flat
list of elements which have id-like values which define
the hierarchy I need.
In addition to G. Ken Holman's XSLT 1.0 solution, here is an XSLT 2.0 one.
The transformation below produces an XML document from the id-strings:
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:my="my:fn"
exclude-result-prefixes="my xs"
>
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/*/*">
<FOO>
<xsl:sequence select=
"my:makeTree(*/field[(_at_)name='external_id']/value, 'FOO/')"/>
</FOO>
</xsl:template>
<xsl:function name="my:makeTree">
<xsl:param name="pIdNodes" as="element()*"/>
<xsl:param name="pPrefix" as="xs:string"/>
<xsl:for-each-group
select="$pIdNodes[starts-with(.,$pPrefix)]" group-by=
"substring-before(concat(substring-after(.,$pPrefix),
'/'),
'/')">
<xsl:variable name="vElName" select=
"concat('V-',current-grouping-key())"/>
<xsl:variable name="vNewPrefix" select=
"concat($pPrefix, current-grouping-key(),'/')"/>
<xsl:element name="{$vElName}">
<xsl:sequence select=
"my:makeTree($pIdNodes, $vNewPrefix)"/>
</xsl:element>
</xsl:for-each-group>
</xsl:function>
</xsl:stylesheet>
When the above is applied on the originally provided XML document:
<btc>
<record table="works">
<record table="external_records">
<field name="external_id">
<value>FOO/1</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/1/1</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/1/2</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/2</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/2/1</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/2/1/1</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/2/1/2</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/2/2</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
<record table="external_records">
<field name="external_id">
<value>FOO/3</value>
</field>
<field name="ds_name">
<value>ms-sources</value>
</field>
</record>
</record>
</btc>
the result is:
<FOO>
<V-1>
<V-1/>
<V-2/>
</V-1>
<V-2>
<V-1>
<V-1/>
<V-2/>
</V-1>
<V-2/>
</V-2>
<V-3/>
</FOO>
From this tree it is trivial to produce the the desired output and any
other possibly desired output.
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
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