Be aware the following:
- The "." is not a short form of self axis!
- The ".." is not a short form of parent axis!
They are not the axis at all but rather the abbreviated location steps.
It is intended to:
-- resolve schema types of steps in a location path.
-- specify a context for relative locatoin paths;
-- specify a context for the root step of the absolute locatoin paths;
-- specify a context for XSL templates or for-each constructs.
Contexts can be organized in chains.