Re: [Chiba-users] xml namespaces

[Tambet M. <tam...@gm...>]

Deer wrote:
> - Please help to explain about xml namespaces is necessary to define in xml
> file or not. 
>   

You don't need to define XML namespaces in XML file, when you populate 
instance from that file.

When you define your instance inline, then you should define default 
namespace in <instance> tag:

<xforms:instance xmlns="">
  <data/>
</xforms:instance>

xmlns="" says that elements without prefix belong to default namespace.

> -If I have two prefix in xml file (such as f:, t:). How to define namespace
> or use default namespace
>   

You have to distinguish between namespace and prefix. Namespace is 
arbitrary URL, like http://www.w3.org/2002/xforms. You bind namespace to 
prefix with attribute xmlns:xforms="http://www.w3.org/2002/xforms". The 
prefix is then usable for this element and all elements below it.

So if you have namespaces fnamespace and tnamespace, then your xml file 
can look something like this:
<t:data xmlns:t="tnamespace" xmlns:f="fnamespace">
  <f:person>
    <f:name>John Smith</f:name>
  </f:person>
</t:data>

Alternatively you can just redefine default namespace at each level:

<data xmlns="tnamespace">
  <person xmlns="fnamespace">
    <name>John Smith</name>
  </person>
</data>

If element is without prefix and there are no namespaces defined, then 
this element belongs to default namespace. These three are equivalent, 
if defined at root level:

<data/>
<data xmlns=""/>
<data xmlns:xforms="http://www.w3.org/2002/xforms"/>

  Tambet