New to XSL here.

I'm working with SharePoint Designer on a SharePoint List View.

There is an option to convert the List to XSL which seems really
promising for what I'm trying to do.

currently, I'm just listing all the columns in a a list.. great.

I added a new column, and was able to insert a column from anther list
as follows:

<xsl:value-of select="/dsQueryResponse/Master/Rows/Row/@Lastname" />

Is it possible with XSL, to insert the value of the first row, where a
column from this list, matches that list.

I'm able to accomplish the goal if I create a joined subview of both
lists, and build a view from scratch (I understand these are very
sharepoint specific operations)... But, for the sake of preserving all
the XSL that is automatically generated by Sharepoint for this list
view, I'm looking to atleast know it's possible to pull data based on
conditional logic.. right now my code is only pulling the column for
the the very first row in the lookup table.

Thanks for any help or information.