layout DXL to display in links from multiple modules in separate columns

I am new to DXL, please help.
I am attempting to write a layout DXL script that allows me to display in links from multiple modules to individual columns (each module will have in links from multiple modules). I started with the canned layout DXL script (simpletr.dxl) which will display all in links from all modules in the same column, but what I want is in links from each module to display in separate columns. What I am doing below (that doesn’t work) is checking for attributes that I know are specific to the module I want in links to display in the column.
What I have doesn’t work, but I included it here anyway. PLEASE HELP.
The lines that don’t work follow;
// Only show traces from this module
// check for an attribute that only exists in this module
if(exists (attribute "TraceToCANES"))
{……
Full script follows;
// TJCJr_02_SoSEng_PEOSpec_C4I_TraceFromPEOSpecONLY_v130
//
// Date Who Description
// 20121212 TJCJr Borrowed this from the example trace DXL
// 20121231 TJCJr Changed what attributes are displayed in the column
// 20121231 TJCJr Only displays in-links from this spec ONLY based on attribute in this module
//
// Original Comments
// Example trace analysis

//
// Licensed Materials - Property of IBM - some unique copyrights (i.e., the ability to copy,
// modify, distribute) may be licensed in certain circumstances (e.g., sample/template code
// intended to be used by customers to build upon and distribute as their own products).
//
// DOORS - %full_filespec: simpletr.dxl~8:dxl:ERS#1 % %date_created: Thu Jan 8 15:24:17 2009 %
//
// (c) Copyright IBM Corporation 1993, 2009. All Rights Reserved.
//
// U.S. Government Users Restricted Rights: Use, duplication or disclosure restricted by
// GSA ADP Schedule Contract with IBM Corp.
//

/*

A basic first-level analysis of all in-links is performed - displaying the Absolute Number
and Object Text of all linked objects.

This file is intended to be easily changed and as such no checks are performed for correct
access controls on objects or object attributes.

To examine other attributes then just change the constants S_ATTR_1 / S_ATTR_2.

To examine more attributes then just duplicate S_ATTR_1 / S_ATTR_2 as well as the lines that
display their actual values.

It should be noted that no checks are performed either on the existence of these attributes
or on their access controls, so you may experience DXL errors unless they are correctly named
and you have read access to them.

If you intend to modify functionality then please make a copy of the original file first.

*/
// prevent dxl timeout dialog
pragma runLim, 0
// change these lines to display different attributes
const string S_ATTR_1 = (NLS_("Absolute Number"))
const string S_ATTR_2 = (NLS_("Object Heading"))
const string S_ATTR_3 = (NLS_("Object Text"))
// Attribute used as a check of this object
const string S_ATTR_4 = (NLS_("Spec"))

Module m = current
Object o = current

// display in-link information
{
Link l
LinkRef lr

// process in-links
for lr in all(obj <- (NLS_("*"))) do
{
// get absolute location of linked module
ModuleVersion sourceVer = sourceVersion(lr)

// only relevant if module exists
if (exists(module sourceVer))
{
// only relevant if module is closed
if (null data(sourceVer))
{
// ensure module is open
load(sourceVer, false)
}
}
}

// process in-links
for l in all(obj <- (NLS_("*"))) do
{
// get absolute location of linked module
ModuleVersion sourceVer = sourceVersion(l)

// only relevant if module exists
if (exists(module sourceVer))
{
Object oSource = source l

// validate handle
if (oSource != null)
{

// Only show traces from this module
// check for an attribute that only exists in this module
if(exists (attribute "TraceToCANES"))
{
// display attribute values
display S_ATTR_1 (NLS_(": ")) oSource.S_ATTR_1 (NLS_(""))
display S_ATTR_2 (NLS_(": ")) oSource.S_ATTR_2 (NLS_(""))
display S_ATTR_3 (NLS_(": ")) oSource.S_ATTR_3 (NLS_(""))
// separate by a blank line
display (NLS_(""))
}
}
}
else
{
// warn user
display LS_("String_Invalid_source_module",NLSTEMP_("Invalid source module '")) (fullName sourceVer) (NLS_("'."))
}
}
}
SystemAdmin - Thu Jan 03 13:26:32 EST 2013

Re: layout DXL to display in links from multiple modules in separate columns
SystemAdmin - Thu Jan 03 17:01:43 EST 2013

Re: layout DXL to display in links from multiple modules in separate columns
SystemAdmin - Fri Jan 04 06:37:50 EST 2013

Re: layout DXL to display in links from multiple modules in separate columns
SystemAdmin - Fri Jan 04 14:21:09 EST 2013

Re: layout DXL to display in links from multiple modules in separate columns
SystemAdmin - Fri Jan 04 14:21:41 EST 2013