Link_Constraint interfaces:
Interface: constraints
Methods:
<node>getTarget <index>index
<boolean>setTarget <node>target <index>index
<float>getFrameNo <index>index <time>time
<boolean>setFrameNo <integer>frameNo <index>index <time>time
<integer>getNumTargets()
<boolean>appendTarget <node>target <time>time
<void>DeleteTarget <integer>targetNumber