[xsl] constructing a "variable" select argument

["Tracey Zellmann" <tracey.zellmann@xxxxxxxxxxx>]

I have a stylesheet where I need to handle several different situations.
I want to make these selections, for instance

<xsl:value-of 
select="$questions//Track[@id='T1']/MCP[@id='MC1']/ReportInstructions"/>
<xsl:value-of select="Report/TrackT1/Position[@position='Left 
Front']/MCHistogram[@id='1']/Average"/>

<xsl:copy-of select="/Report/TrackT1/Position[@position='Left 
Front']/MCHistogram[@id='1']/svg:svg"/>


In different situations, the value T1 and MC1 change, to say T2 and MC2, and 
position might be Right Rear.

I am trying to create a template that will handle that, where I could pass 
in three parameters, say trackId, mcpID, and position and then construct the 
unique string with concatenation functions, say $selectArgument, and have a 
statement in the template like
<xsl:value-of select="$selectArgument"/> or
<xsl:copy-of select="$selectArgument"/>
or something like it, that would do the job.

However, I am unsure how to handle the various quotation marks and their 
escaping, etc.

Could someone point me in the right direction?

Thanks.