XSLT conditions matching with list stored in external file - list

Question

I am trying to write a XSLT which extracts items matches the conditions listed in another file.
INPUT FILE (input.xml)
<ItemList>
<Item>
<Product>ABC</Product>
<Price>10.00</Price>
</Item>
<Item>
<Product>DEF</Product>
<Price>20.00</Price>
</Item>
<Item>
<Product>GHI</Product>
<Price>30.00</Price>
</Item>
<Item>
<Product>JKL</Product>
<Price>40.00</Price>
</Item>
</ItemList>
External List File (Codes.xml)
<ProductCodeList>
<ProductCode>ABC</ProductCode>
<ProductCode>JKL</ProductCode>
</ProductCodeList>
Expected Output (output.xml)
<ItemList>
<Item>
<Product>ABC</Product>
<Price>10.00</Price>
</Item>
<Item>
<Product>JKL</Product>
<Price>40.00</Price>
</Item>
</ItemList>
Could you please show me which one is not working?
<xsl:variable name="productCodeList" select="document('Codes.xml')/ProductCodeList/ProductCode" />`
<xsl:template match="/">
<xsl:apply-templates select="/ItemList/Item[Product=$productCodeList]"/>
</xsl:template>
<xsl:template match="/ItemList/Item">
<xsl:copy-of select="."/>
</xsl:template>

Answer 1

This simple (no conditionals, no current()) transformation:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:variable name="vProds" select=
"document('file:///c:/temp/delete/ProductList.xml')"/>
<xsl:template match="/">
<ItemList>
<xsl:copy-of select=
"/*/Item
[Product
=
$vProds/*/ProductCode
]
"/>
</ItemList>
</xsl:template>
</xsl:stylesheet>
when applied on the provided XML document:
<ItemList>
<Item>
<Product>ABC</Product>
<Price>10.00</Price>
</Item>
<Item>
<Product>DEF</Product>
<Price>20.00</Price>
</Item>
<Item>
<Product>GHI</Product>
<Price>30.00</Price>
</Item>
<Item>
<Product>JKL</Product>
<Price>40.00</Price>
</Item>
</ItemList>
and having the provided Productlist.xml stored at c:\temp\delete:
<ProductCodeList>
<ProductCode>ABC</ProductCode>
<ProductCode>JKL</ProductCode>
</ProductCodeList>
produces the wanted, correct result:
<ItemList>
<Item>
<Product>ABC</Product>
<Price>10.00</Price>
</Item>
<Item>
<Product>JKL</Product>
<Price>40.00</Price>
</Item>
</ItemList>

Answer 2

Does that maybe work better?
<xsl:variable name="productCodeList" select="document('Codes.xml')/ProductCodeList/ProductCode" />
<xsl:template match="/">
<xsl:apply-templates select="/ItemList/Item"/>
</xsl:template>
<xsl:template match="/ItemList/Item">
<xsl:if test="$productCodeList[.=current()/Product]">
<xsl:copy-of select="."/>
</xsl:if>
</xsl:template>