How the property: “namespaceURI” works?

@7studOct 19.2004 — #Hi,

I don't know much about namespaces in XML, but a namespace in any language is a way to prevent name 'collisions'. Lets say you have some XML like this:

&lt;book&gt;
 &lt;author&gt;Paul Wilton&lt;/author&gt;
 &lt;title&gt;Beginning Javascript&lt;/title&gt;
 &lt;/book&gt;
 
 &lt;director&gt;
 &lt;name&gt;Dr. Smith&lt;/name&gt;
 &lt;title&gt;Professor Emeritus&lt;/title&gt;
 &lt;/director&gt;

If you want to refer to the <title> tag, you have a problem because there are two different title tags with two very different meanings and contexts. To prevent name collisions like that, you can define a namespace for each section of your code like this(this is psuedo code):

<i>
 </i>-----------namespace1------------
 &lt;book&gt;
 &lt;author&gt;Paul Wilton&lt;/author&gt;
 &lt;title&gt;Beginning Javascript&lt;/title&gt;
 &lt;/book&gt;
 ---------------------------------
 ----------namespace2-------------
 &lt;director&gt;
 &lt;name&gt;Dr. Smith&lt;/name&gt;
 &lt;title&gt;Professor Emeritus&lt;/title&gt;
 &lt;/director&gt;
 ---------------------------------

Then you can refer to the specific <title> tag like this:

namespace1: <title>

namespace2: <title>

That way there is no ambiguity as to which tag you are refering to.

If you think about people working on large coding projects, with each person handling a section of the code, they might use the same names for variables, tags, etc. and that could cause big problems when the code is combined. But, if the project manager gives each programmer a unique namespace to use, which is a qualifier to the variable or tag name, then name collisions will be prevented.

See here for more details and examples:

http://www.rpbourret.com/xml/NamespacesFAQ.htm

I hope that helps. ?

How the property: “namespaceURI” works?

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