NamespaceURI
NamespaceURI is the Uniform Resource Identifier that identifies the namespace associated with an XML element or attribute. It is used to distinguish names that share the same local part but belong to different vocabularies by qualifying them with a namespace.
In XML, the expanded name of a node consists of a namespace URI and a local name.
In programming interfaces such as the Document Object Model (DOM), the NamespaceURI property exposes this value.
Practical use includes XML processing and XPath evaluation, where correct namespace mappings are required for queries