Check if a node satisfies conditions on the type or name of a node.
A NodeTest defines type or name of a node in a
NodeTest. It can be a NameTest, a node type as
defined in NodeType or a processing instruction which optionally
can have a name that conforms to the definition of a Literal.
A NameTest is either a name or a wildcard expression
matching a set of names. If NameTest is
"*", it matches any name, otherwise it matches a
given name.
Using NodeType(), you can select nodes of the specified
type ("comment", "node",
or "text") on the relevant axis. As a further type
of node, you can select processing instruction nodes (represented as
<?PITarget?>) which may or may
not have a Literal. A Literal is a sequence of
characters that is enclosed either in double quotes (then it must not contain a
double quote) or in single quotes (then it must not contain a single
quote).
Note:
Only processing instruction nodes (PIs) that are nested inside the
root node element can be selected. Any PIs outside are not accounted for, such
as the XML declaration that looks like a PI and declares a document to be an
XML document (<?xml version="1.0"?>).
It corresponds to the expression NodeTest defined in XPath,
Section 2.3, Rule
7 with the exception that in X-Query it formally also subsumes the
definition of an unnamed processing instruction which in XPath is included in
the definition of NodeType instead. However, this difference is of
no practical relevance.
NameTest and Literal correspond to the
respective XPath expressions, as defined in the
Section 3.7,
Rules 37 and 29.
Select all child elements of the context node (NameTest
matching any name by using a wildcard; it is a shorthand for the relative
location path child::*)
*
Retrieve all children of the context node:
node()
NodeType |
Step |