Joint markers can be specified a list of joint name either stripped or full form e.g. JointMarkers->{"RotationalJoint-1"}
It is possible to use string pattern that pulls out a list of matching name e.g. JointMarkers->"*Fixed*"
Also it is possible to define a list of integer which will converted into a Regular expression to pull out the list of matching joint names. e.g JointMarkers->{1,2} converted to ReqularExpression[".*[12]"].
Finally it is allowed to specify RegularExpression as filtering expressions.