The XPath central axis is used to specify a set of nodes used to filter by the remainder in the current positioning step.
He is a fine-tuning for the set of nodes generated by the previous positioning, equivalent to the coordinate transformation of the geometry
E.g:
Query expression:
/ MyDataSet / NorthwindemPloyees / Employee / EMPLOYEEID / PARENT :: * [Employeeid> 7]
Medium Parent :: Letting the context node of his positioning step by EMPLOYEEID to Employee
