increare counter based on the length of the line in rtf template

Hi All,

I am doing rtf template , PDF output

I have below code lines per page tag

<xsl:variable name="lpp" select="number(30)"/><?xdoxslt:set_variable($_XDOCTX, 'V_LINES', 0)?>

in the line level,

<?CF_LNO?><?xdoxslt:set_variable($_XDOCTX, 'V_LINES',xdoxslt:get_variable($_XDOCTX, 'V_LINES')+1)?>

Here, ITEM_DESC is printing 55 length of data this is fine, if the length of data is more the 55 then

I want to add/write code, if the length of the line is greater than the limit , need to increase the line counter.

could you please help me how to write the code based on the length .