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Asked: 2026-05-10T22:35:29+00:00

A related question to one I asked earlier … Just checking on something: Should

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A related question to one I asked earlier…

Just checking on something: Should the order of the xmlns, xmlns:xsi and xsi:schemaLocation attributes in an XML file matter?

I’m finding that it does – at least when using XML Notepad 2007 to view the XML file. For example (assuming that my XML file is legal according to my schema) this gives no errors (Example 1):

<myroot      xmlns='http://www.someurl.com/ns/myroot'      xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'      xsi:schemaLocation='http://www.someurl.com/ns/myroot http://www.someurl.com/xml/schemas/myschema.xsd'>     <sometag>somecontent</sometag>  </myroot>

but this one does (Example 2):

<myroot      xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'      xsi:schemaLocation='http://www.someurl.com/ns/myroot http://www.someurl.com/xml/schemas/myschema.xsd'     xmlns='http://www.someurl.com/ns/myroot'>      <sometag>somecontent</sometag>  </myroot>

(the error being that ‘sometag’ is an illegal entry according to the schema).

My problem is that if I use the code from my other question to generate my namespace and schema attributes then I get the XML attributes output in the Example 2 order…

Does the xmlns attribute always have to be first in the attribute list?

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1 Answer

  1. Ah – I’ve spotted my problem….

    The XML I’m actually working on is fiendishly complicated and I hadn’t noticed that I’d inserted an xmlns=” in all my child nodes. Once I remove that the problem goes away and the ordering of namespace attributes makes no difference – which is what I expected…

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