After you create a custom catalog, you need to edit the system ID's
                that tell IXIA CCMS Desktop which DTDs to
                recognize when content is imported into the CMS. (This file does not determine the
                DOCTYPE of content that is created in the CMS; that is determined by the topic and
                map templates.)
        
        - 
                In Repository/system/conf, check out and open
                        systemid.xml.
                
                    When you import DITA content that you've created outside of
                        the IXIA CCMS Desktop, the CMS looks at the DOCTYPE
                        reference. If the reference is not one that is recognized by the CCMS Desktop (according to what is listed in systemid.xml), the CCMS Desktop automatically remaps it to whatever the topicdefault is (or mapdefault,
                        if you're importing a map). By default, this file defines two public id's
                        that are accepted as defaults to map to. The defaults out of the box are the
                        IxiaDitabase.dtd and IxiaMap.dtd. If you want your imported content to be remapped to your custom shell DTDs,
                        it's critical to edit systemid.xml accordingly. 
 
- 
                In the first line, change the value of mapdefault to the public identifier of
                        CompanyMap.dtd, as shown.
                
                    <id mapdefault="-//COMPANY//DTD DITA Map//EN" topicdefault="-//IXIA//DTD IXIA DITA Composite//EN">
 
 
- 
                In the same line, change the value of topicdefault to the public identifier of
                        CompanyDitabase.dtd, as shown.
                
                    <id mapdefault="-//COMPANY//DTD DITA Map//EN" topicdefault="-//COMPANY//DTD DITA Composite//EN">
 
 
- 
                In the first reference line, change the public identifier to the public
                    identifier of CompanyDitabase.dtd, as shown.
                
                    <reference public="-//COMPANY//DTD DITA Composite//EN" system="IxiaDitabase.dtd"/>
 You must have a reference for the DTD that you are using as the default. Important: Note that you are replacing references to
                            IxiaDitabase.dtd with references to the custom
                        shell DTD in your plugin. Your shell completely takes the place of IxiaDitabase.dtd. This is unlike your custom catalog.xml, which does not replace, but adds to the
                        functionality of the default catalog.xml file in the
                            com.ixiasoft.dita13.dtd
                        plugin. 
 
- 
                In that same line, change the system identifier path to reference
                        CompanyDitabase.dtd, as shown.
                
                    <reference public="-//COMPANY//DTD DITA Composite//EN" system="CompanyDitabase.dtd"/>
 Note: If you worked with systemid.xml in the past, you might
                        notice that here, the system id is simply the file name without any path,
                        whereas in previous releases, the system id included a relative path. This
                        change does not have any effect on your content. XML editors use their own
                        catalog settings to resolve DTDs and the DITA Open Toolkit is entirely
                        catalog-based, so it does not use system id's at all. 
 
- 
                In the second reference line, change the public identifier to the public
                    identifier of CompanyMap.dtd, as shown.
                
                    <reference public="-//COMPANY//DTD DITA Map//EN" system="IxiaMap.dtd"/>
 
 
- 
                In that same line, change the system identifier path to reference
                        CompanyMap.dtd, as shown.
                
                    <reference public="-//COMPANY//DTD DITA Map//EN" system="CompanyMap.dtd"/>
 
 
- 
                Save and check in systemid.xml.
            
The CCMS Desktop is now set up to recognize
                CompanyDitabase.dtd and CompanyMap.dtd
                when importing topics or maps.
        
        
            Next, you need to edit the topic and map templates to include a
                DOCTYPE that references CompanyDitabase.dtdand CompanyMap.dtd.