Create and possibly filter a sequence of nodes.
The following construct(s) refer to this construct:
An AxisStep is a step expression that creates a sequence of
nodes. Beginning at the context node, it takes a step in forward or reverse
direction of the given axis.
The unabbreviated form requires a node test that checks whether the node
is of a certain kind or whether it passes a name test. You can specify a
predicate expression by using StepQualifiers to filter the current
sequence of nodes.
The abbreviated form allows you to use shorthand notations for the axes
self, parent and attribute.
Select all books written by Stevens:
input()/descendant-or-self::book[child::author/child::last = "Stevens"]
Starting from the document node, this query uses the unabbreviated form
to take a step on the descendant-or-self axis and adds any
book (NodeTest) to the sequence. Those
elements are retained that satisfy the following predicate expression
(StepQualifiers): there is a child element node
author that has a child element node
last whose string value is
"Stevens".
