///<summary>
///relationship of joined parts
///</summary>
public void setRelationship(Relationship pRelationship)
{
_relationship = pRelationship;
}
/**
* Compares for reference equality and value equality.
*/
public bool equals(Relationship rhs)
{
bool ivarsEqual = true;
if(rhs.GetType() != this.GetType())
return false;
if( ! (_nature == rhs._nature)) ivarsEqual = false;
if( ! (_position == rhs._position)) ivarsEqual = false;
return ivarsEqual;
}