XML document default namespace

Question

A friend showed me the following XML doc and asked me some questions. I'd like to check them with you

For the XML document

<?xml version="1.0"?>
<product xmlns:m="urn:example.com:catalog">
    <m:productInfo>
        <detail xmlns="urn:example.com:products">
            <name>Hello World!</name>
        </detail>
    </m:productInfo>
</product>

What is the URI of the namespace to which the top level <product> element belongs?
What is the URI of the namespace to which the <productInfo> element belongs?

Thanks!

Will your "friend" also be awarding you marks based on how you answer these questions? — Damien_The_Unbeliever
– Damien_The_Unbeliever, Commented May 27, 2014 at 7:26
LOL. On the absence of reputation points I will be accepting money... or beer. — Alexandre Santos
– Alexandre Santos, Commented May 27, 2014 at 7:27
Here's another 2 - what namespace is detail in, and what namespace is element name in? — StuartLC
– StuartLC, Commented May 27, 2014 at 7:29

StuartLC · Accepted Answer · 2014-05-27 15:40:04Z

2

product is in the no namespace (sometimes informally called global namespace), since, although it defines the namespace alias xmlns:m="urn:example.com:catalog", product itself is not in this namespace.

Product would only be in namespace urn:example.com:catalog if it was declared either:

<m:product xmlns:m="urn:example.com:catalog">

or if it reset the default namespace:

<product xmlns="urn:example.com:catalog">

productInfo IS in namespace urn:example.com:catalog, for the reason above.

Detail resets the default namespace:

<detail xmlns="urn:example.com:products">

Which means that detail, and sub-elements (such as name) are also in namespace urn:example.com:products

edited May 27, 2014 at 15:40

answered May 27, 2014 at 7:51

StuartLC

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