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Asked: 2026-05-11T14:20:57+00:00

Been wondering, just as we use the -declaration to bind XML to a DTD,

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Been wondering, just as we use the -declaration to bind XML to a DTD, how do we do it with XSD?

MSDN sample:

<?xml version='1.0'?> <Product ProductID='123'      xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'     xsi:noNamespaceSchemaLocation='Product.xsd'>     <ProductName>Rugby jersey</ProductName> </Product>

is it the xsi:NoNamespaceSchemaLocation that does the trick? Or is this just another namespace?

[EDIT] And is the 

xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'

..line just for giving us a unique XML namespace, or does it also provide information on where the schema can be located?

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1 Answer

  1. Try schemaLocation. 

    <?xml version='1.0'?>  <note xmlns='http://www.w3schools.com' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.w3schools.com note.xsd'>   <to>Tove</to>   <from>Jani</from>   <heading>Reminder</heading>   <body>Don't forget me this weekend!</body> </note>

    noNamespaceSchemaLocation is different. Note that both are indeed only ‘hints’ in theory, to a consumer of an XML document. I’ve never run into an xml processor that did not follow them; after all, it’s a W3C recommendation. see http://www.w3.org/TR/xmlschema-1/

    But indeed, it could go wrong, as here, but then again, it’s considered a bug for a reason.

    To go short : I just trust it, with no harm so far 🙂

    I don’t think any half-decent xml processor can ignore this ‘hint’ these days.

    The urls are always for uniqueness, but in some cases some info will be provided under the URL.

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