XPath axes are used to set relation of current node with another node. A list of XPath axes to set relation with other nodes are :
ancestor : It is used to get all ancestor (parent, grandparent etc) of current node.
ancestor-or-self : It is used to get all ancestors (parent, grandparent, etc.) of the current node and also the current node.
attribute : It is used to get all attributes of the current node.
child : It is used to retrieve all children of the current node.
descendant : It is used to get all descendants (children, grandchildren, etc.) of the current node.
namespace : It is used to get all namespace nodes of the current node.
preceding : It is used to get everything in the document that is comes before the start tag of the current node.
