[Uml-user] How to extract associations between states in state diagram?

[funkyworklehead at yahoo.com]

I've drawn a simple finite state machine(FSM)
in Umbrello as a "State Diagram"


     +---+   EVENT_A   +---+
     | A |------------>| B |
     +---+             +---+

Given this FSM I would like to extract the
associations from the XML. i.e. I would like
to read the xml file produced by this drawing
and gain the following information:

 There are 2 states: 
    - A
    - B
 There is 1 association (transition): 
     - <transition_1>:
        type = directed (i.e. 1 endpoint)
       text = EVENT_A
       begin point = state A
        endpoint = state B

Does anyone know what attributes of the XML will
give me this information?  I can't seem to find 
a pattern.  I don't see how the states and 
transition arrow are linked by looking at the 
attributes of the XML.
Example StateWidget:
<--! FOR STATE A -->
<UML:StateWidget statetype="1" statename="A" usesdiagramfillcolour="1" width="47" usesdiagramusefillcolour="1" x="172" linecolour="none" y="185" instancename="" usesdiagramlinecolour="1" fillcolour="none" height="27" usefillcolor="1" isinstance="0" xmi.id="11" documentation="" font="Sans Serif,10,-1,5,50,0,0,0,0,0" >
<--! FOR STATE B -->
<UML:StateWidget statetype="1" statename="B" usesdiagramfillcolour="1" width="47" usesdiagramusefillcolour="1" x="342" linecolour="none" y="195" instancename="" usesdiagramlinecolour="1" fillcolour="none" height="27" usefillcolor="1" isinstance="0" xmi.id="12" documentation="" font="Sans Serif,10,-1,5,50,0,0,0,0,0" >

<--! Association widget -->
<associations>
     <UML:AssocWidget totalcounta="2" indexa="1" visibilityB="200" totalcountb="2" indexb="1" widgetbid="12" widgetaid="11" roleBdoc="" roleAdoc="" type="514" changeabilityA="900" changeabilityB="900" visibilityA="200" >
      <linepath>
       <startpoint startx="219" starty="198" />
       <endpoint endx="342" endy="208" />
      </linepath>
      <UML:FloatingTextWidget usesdiagramfillcolour="1" width="120" usesdiagramusefillcolour="1" x="280" linecolour="none" y="203" instancename="" posttext="" usesdiagramlinecolour="1" role="703" fillcolour="none" height="20" usefillcolor="1" pretext="" isinstance="0" xmi.id="-1" text="EVENT_A" font="Sans Serif,10,-1,5,50,0,0,0,0,0" />
      <UML:FloatingTextWidget usesdiagramfillcolour="1" width="16" usesdiagramusefillcolour="1" x="221" linecolour="none" y="200" instancename="" posttext="" usesdiagramlinecolour="1" role="709" fillcolour="none" height="20" usefillcolor="1" pretext="+" isinstance="0" xmi.id="-1" text="" font="Sans Serif,10,-1,5,50,0,0,0,0,0" />
      <UML:FloatingTextWidget usesdiagramfillcolour="1" width="16" usesdiagramusefillcolour="1" x="324" linecolour="none" y="186" instancename="" posttext="" usesdiagramlinecolour="1" role="710" fillcolour="none" height="20" usefillcolor="1" pretext="+" isinstance="0" xmi.id="-1" text="" font="Sans Serif,10,-1,5,50,0,0,0,0,0" />
     </UML:AssocWidget>
    </associations>

I don't want to try to extract the information from the X,Y position
co-ordinates, because who is to say that some of the consumers of my
code in process won't overlap states...

Does anyone know?  Could a developer give me a hint?

Thanks.




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