How to query an transaction array set's attribute in printer friendly XSL view

Summary:

How to query a transaction array set attribute in the XSL view

Content (required):

I want to use (in printer friendly XSL) a transaction array set (xyz_t) attribute (attr_t).

How to query "attr_t" attribute in the XSL. This printer friendly is being mapped to an action button under XSL views tab

I am able to to query non array set using :

<xsl:variable name="abc" xmlns:str="http://exslt.org/strings"select="$main_doc/someattribute_t"/>

<xsl:value-of select="$abc"/>

But transaction array set attributes doesn't work similar to the above code

Version (include the version you are using, if applicable):