I looked into this and I can't find this in the core files. I checked the community files and found:
Code:
3.5 - Spell Compendium.user(7368): <tag group="sRange" tag="Unlimited" name="See Text" abbrev="{ref s_Unlim}Unl{ref}"/>
3.5 - Spell Compendium.user(8690): <tag group="sRange" tag="Unlimited" name="See Text" abbrev="{ref s_Unlim}Unl{ref}"/>
3.5 - Spell Compendium.user(8715): <tag group="sRange" tag="Unlimited" name="See Text" abbrev="{ref s_Unlim}Unl{ref}"/>
3.5 - Spell Compendium.user(10150): <tag group="sRange" tag="Unlimited" name="See Text" abbrev="{ref s_Unlim}Unl{ref}"/>
On the same safe side all tag group should ONLY have group and tag no name or abbrev elements in the XML. These usually appear when you have done a 'duplicate' using the editor. For Pathfinder community stuff I strip all name/abbrev elements out so you don't have this exact issue.
If you do need to add new dynamic tag I keep a central file that contains them so less issues if you do want to make a change.
Just some FYI info...