Here are the supported values for AgRelative Control.
Operate on the current item defined in the path
RELATIVE_SELF = 0;
Operate on the parent of the current item defined in the path
RELATIVE_PARENT = 1;
Operate on a child of an ancestor in the current path
RELATIVE_CHILD_OF_ANCESTOR = 2;
Operate on a child of the current path or a child of an ancestor in the current path.
RELATIVE_CHILD_OF_ANCESTOR_OR_SELF = 3;
Operate on a child of the current path
RELATIVE_CHILD_OF_SELF = 4;
Operate on any ancestor (parent) who matches the desired type
RELATIVE_ANCESTOR = 5;
Operate on any ancestor (parent) or the current element who matches the desired type
RELATIVE_ANCESTOR_OR_SELF = 6;