Include XSL inside XSL
If XML/XSL Transforms is your domian, then there are times when we want a peice of Dynamic code to be used library item(to be made re-usable). What I mean , probably could be made more clear with this example scenario.
Imagine you are creating a website (and using XML, XSL transfroms ofcourse) and most of the pages would have a Comments Module . Well! then either you copy or paste this code into every page template (which I dont have say, but make maintenance and rework a nightmare) or even better, you create an INCLUDE file which could be pulled in where ever you want it in your page(s)…
So HOW DO WE CREATE a XSL INCLUDE file and include it inside another XSL file? Here is how…
Just to make things clear … here is quick list of files that you would create … here , we will be including info about fruits and vegetables into a parent page called food.
1. food.xml – xml data file on which the transformation will be applied
2. food.xsl - main XSL file, which will transform our food.xml
3. inc_fruits.xsl – XSL include file that will render fruits data
4. inc_vegtables.xsl – XSL include file that will render vetetables data
I dont think I have explain much , the codes for above elements , will be self explanatory…
FOOD.XML
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="food.xsl"?>
<food>
<date>July 2008</date>
<description>All about things we eat everyday</description>
<fruits type="tropical">
<item name="mango" moreinfo="http://www.mango.com">Mango is the king of fruits</item>
<item name="banana" moreinfo="http://www.banana.com">Banana once a day , keeps the doctor away</item>
<item name="orange" moreinfo="http://www.orange.com">Orange is the color and rich in vitamin C</item>
<item name="Papaya" moreinfo="http://www.papaya.com">Papaya - Hot when raw, cold when ripe</item>
</fruits>
<vegetables>
<item name="spinach" moreinfo="http://www.spinach.com">Spinach is full of iron</item>
<item name="asparagus" moreinfo="http://www.asparagus.com">Asparagus contains loads of vitamin D </item>
<item name="fenugreek" moreinfo="http://www.fenugreek.com">Fenugreek is rich in vitamin C</item>
</vegetables>
</food>
FOOD.XSL
<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:include href="inc_fruits.xsl" />
<xsl:include href="inc_vegetables.xsl" />
<xsl:template match="/">
<html>
<head>
<title>Title</title>
</head>
<body>
<h3><xsl:value-of select="/food/description" /></h3>
Modification Date : <xsl:value-of select="/food/date" />
<hr/>
<h5> About Fruits</h5>
<xsl:call-template name="about_fruits"/>
<hr/>
<h5> About Vegetables</h5>
<xsl:call-template name="about_vegetables"/><hr/>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
INC_FRUITS.XSL
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="iso-8859-1" />
<xsl:template name="about_fruits">
<xsl:for-each select="/food/fruits/item/@*">
attribute name : <xsl:value-of select="name()"/>
attribute value : <xsl:value-of select="."/> <br />
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
INC_VEGETABLES.XSL
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="iso-8859-1" />
<xsl:template name="about_vegetables">
<xsl:for-each select="/food/vegetables/item/@*">
attribute name : <xsl:value-of select="name()"/>
attribute value : <xsl:value-of select="."/> <br/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
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