LOCPOS Dynamic Value
Specifies a specific position of the current location.
The format of a location is digit1,digit2,...,digitn. LOCPOS:0 is equal to digit1, LOCPOS:1 is equal to digit2, etc.
In this example, the program is divided into chapters, and each chapter has a menu and several other sublocations. This global button defines a "Chapter X Menu" button to appear in each of the chapter's sublocations but not the chapter's menu (that is, when the second digit of the location is greater than zero):
<BUTTON TITLE="Chapter %s Menu" SUBST="%s,LOCPOS:0" TARGET="LOCPOS:0,0" APPLIESTO="GREATER" GREATER="LOCPOS:1>0" />