Lookup tables with variable keys

It is absolutely not clear what you want to do
But I assume you are looking for dealing with a combined key?
Wel, combined keys can easily be achieved by concatening the keys
or by having an "and" inside the predicate.

Can you explain what exactly you want to do?

Sorry, the snippet did not have enough context.

I want to loop through the list of NAICS codes in the XML file, and use a composite key (consisting of Organization, Facility, NAICS) to look up the corresponding Classification and Percentage in the lookup table. Because this facility has more than one NAICS code, the $ThisFacilityNAICS variable cannot be set to a specific value.

<lookup:NAICS_Classification_Percentage>
	<FacilityNAICS Classification="ccc" Percentage="60">Two Code Inc. Industrial Heartland 123456</FacilityNAICS>
	<FacilityNAICS Classification="ddd" Percentage="40">Two Code Inc. Industrial Heartland 456789</FacilityNAICS>
</lookup:NAICS_Classification_Percentage>

<xsl:for-each select="/Report/Report_Detail/IdentificationProfile/Facility/NAICS_Codes/NAICS">
	<xsl:variable name="ThisFacilityNAICS" select="concat(/Report/OrganisationNameEn, ' ', /Report/FacilityNameEn, ' ', /Report/Report_Detail/IdentificationProfile/Facility/NAICS_Codes/NAICS/NAICSCodeEn)"/>
	<NAICSCode>
		<NAICSClassification>
			<xsl:value-of select="document('')//lookup:NAICS_Classification_Percentage/FacilityNAICS[. = $ThisFacilityNAICS]/@Classification"/>
		</NAICSClassification>
		<Code>
			<xsl:value-of select="NAICSCodeEn"/>
		</Code>
		<ActivityPercentage>
			<xsl:value-of select="document('')//lookup:NAICS_Classification_Percentage/FacilityNAICS[. = $ThisFacilityNAICS]/@Percentage"/>
		</ActivityPercentage>
	</NAICSCode>
</xsl:for-each>

Select all Open in new window

just change the lookup

      <FacilityNAICS Classification="ccc" Percentage="60" organisation="Two Code Inc." facility="Industrial Heartland " NAICS="123456"/>

and go for

FacilityNAICS[@organisation = ...][@facility = ...][@NAICS = ...]/@Classification

no need to compound in the lookup, it is better to keep them seperated

I tried that but it's not working.

<lookup:NAICS_Classification_Percentage>
	<FacilityNAICS Org="Two Code Inc." Facility="Industrial Heartland " NAICS="123456" Classification="ccc" Percentage="60" />
	<FacilityNAICS Org="Two Code Inc." Facility="Industrial Heartland " NAICS="456789" Classification="ddd" Percentage="40" />
</lookup:NAICS_Classification_Percentage>

<xsl:for-each select="/Report/Report_Detail/IdentificationProfile/Facility/NAICS_Codes/NAICS">
	<xsl:value-of select="document('')//lookup:NAICS_Classification_Percentage/FacilityNAICS[@Org = /Report/OrganisationNameEn][@Facility = /Report/FacilityNameEn][@NAICS = NAICSCodeEn]/@Classification"/>, 
	<xsl:value-of select="document('')//lookup:NAICS_Classification_Percentage/FacilityNAICS[@Org = /Report/OrganisationNameEn][@Facility = /Report/FacilityNameEn][@NAICS = NAICSCodeEn]/@Percentage"/>
</xsl:for-each>

Select all Open in new window

that is a bit tricky (call it the higher science of XSLT :-)

[@Org = /Report/OrganisationNameEn]

because of the document('') the context in teh predicate is the XSLT file, no longer the source XML file. If you need to do that, you need to bind the source to a variable first

<xsl:variable name="source" select="."/>
at the top level of your stylesheet

then you can do this
[@Org = $source/Report/OrganisationNameEn]

How about the third predicate? How would I specify the context?

[@NAICS = NAICSCodeEn]