5.4 Namespace Nodes
Namespace Nodes
Each element has an associated set of namespace nodes, one for each
distinct namespace prefix that is in scope for the element (including
the xml prefix, which is implicitly declared by the XML
Namespaces Recommendation XMLNAMES) and one for
the default namespace if one is in scope for the element. The element
is the
[parent]
of each of these
namespace nodes; however, a namespace node is not a child of
its parent element. Elements never share namespace nodes: if one element
node is not the same node as another element node, then none of the
namespace nodes of the one element node will be the same node as the
namespace nodes of another element node. This means that an element
will have a namespace node:
-
for every attribute on the element whose name starts with
xmlns:;
-
for every attribute on an ancestor element whose name starts
xmlns: unless the element itself or a nearer ancestor
redeclares the prefix;
-
for an xmlns attribute, if the element or some
ancestor has an xmlns attribute, and the value of the
xmlns attribute for the nearest such element is
non-empty
NOTE:
An attribute xmlns="" "undeclares"
the default namespace (see XMLNAMES).
A namespace node has an
[expanded-name]
: the local part is
the namespace prefix (this is empty if the namespace node is for the
default namespace); the namespace URI is always null.
The
[string-value]
of a
namespace node is the namespace URI that is being bound to the
namespace prefix; if it is relative, it must be resolved just like a
namespace URI in an
[expanded-name]
.
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