XML namespace

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Term Definition
XML namespace

Used to define the elements and attributes within an XML document for search engines to understand its structure.

In XML documents, an XML namespace is a mechanism for uniquely identifying elements and attributes within a document, even when those elements and attributes share the same names. This can be crucial when an XML document needs to incorporate elements or attributes from multiple vocabularies, as it prevents conflicts and ensures each element has a distinct meaning.

Here's a breakdown of the key aspects:


  • Avoids conflicts when combining elements from different vocabularies.
  • Enables elements with the same name to coexist within a document while representing different things.
  • Provides additional context and meaning to elements and attributes.

How it works:

  • Each namespace is identified by a unique URI (Uniform Resource Identifier), typically a URL.
  • Elements and attributes can be associated with a namespace using the xmlns attribute.
  • Prefixes can be used for brevity, making the element names more readable.


  • Clarity and structure: Namespaces prevent ambiguity and provide clear distinctions between elements from different sources.
  • Reusability: Elements and attributes from different vocabularies can be easily combined and reused.
  • Interoperability: Documents using namespaces can be more easily understood and processed by different software tools.