Referencing column values in a grid is a little different than you may have seen before.  When using a standard list you can reference the value of a column using an XSLT variable of the same name ($COLUMNNAME).  This is not possible with the grid so it is necessary to access a column with the following XPath expression:
../lxml:column\[@name='COLUMNAME'\]
 
This is not necessary for referencing the current column (i.e. the column containing the weblet).  In this case you can use a single period (.).
If you know the position of the column you want to reference, you can use an Xpath expression like this:
../lxml:column\[2\]
 
This is handy for large lists as it is much faster but it may cause problems if you change the order of the columns in your list.
Note: All field and column name references in XPath expressions must be uppercase. All references to repository fields must use the object name for the field.
Also see
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The XPath expression tells the XSLT processor where to find the column in the XML data output by the Webroutine.  Like DOS or Linux file paths, the expression indicates a path to the target data from the current position and, like file paths, a period (.) refers to the current position and two periods (..) refer to the parent. Following is the XML output for a single row in the list:  <lxml:entry>    <lxml:column name="EMPNO" id="EMPLIST.0002.EMPNO">A0090</lxml:column>    <lxml:column name="SURNAME" id="EMPLIST.0002.SURNAME">BLOGGS</lxml:column>    <lxml:column name="GIVENAME" id="EMPLIST.0002.GIVENAME">FRED JOHN ALAN</lxml:column>    <lxml:column name="DEPTMENT" id="EMPLIST.0002.DEPTMENT">FLT</lxml:column> </lxml:entry>  When processing a weblet in a grid column, the current position in the XML is the <lxml:column> tag for that row and column.  An XPath expression like this:     ../lxml:column\[@name='EMPNO'\]  says to go up to the parent <lxml:entry> tag, look for a child <lxml:column> tag with a name attribute of 'EMPNO' and return it.