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SelectionNamespaces Property

  • Articolo

 

Specifies namespaces for use in XPath expressions when it is necessary to define new namespaces externally. Namespaces are defined in the XML style, as a space-separated list of namespace declaration attributes. You can use this property to set the default namespace as well.

This property is supported in MSXML 3.0 and 6.0. The default value is "".

Script Syntax

domObj.setProperty(strProp, strVal);  
strVal= domObj.getProperty(strProp);

Example

The following JScript example shows how to use the SelectionNamespances property to specify namespaces in order to query elements that belong to different namespaces from an XML document.

XML File (example.xml)

The following example contains elements that belong to "a" and "b", in addition to elements that do not belong to any namespace.

<?xml version="1.0"?>

<root>

<branch>branch</branch>

<a:root xmlns:a="http://myserver.com">

<a:branch>a-branch</a:branch>

<b:branch xmlns:b="http://yourserver.com">

b-branch

</b:branch>

</a:root>

</root>

JScript Code

Notice that the following code uses "na" and "nb" as the namespace aliases for the "http://myserver.com" and "http://yourserver.com" namespaces. The corresponding namespace aliases are "a" and "b" in the input document (example.xml).

var dom = new ActiveXObject("MSXML2.DOMDocument.6.0");
dom.async= false;
dom.validateOnParse = false;
dom.load("example.xml");
if (dom.parseError.errorCode!=0) 
{
    alert("can't load dom" + dom.parseError.reason);
       exit;
}

ns = "xmlns:na='http://myserver.com' xmlns:nb='http://yourserver.com'";

alert("ns:(before setProperty())\n  "+dom.getProperty("SelectionNamespaces"));
dom.setProperty("SelectionNamespaces", ns);
alert("ns:(after setProperty())\n  "+dom.getProperty("SelectionNamespaces"));

node = dom.selectSingleNode("//root");
alert("root: \n"+node.xml);

node = dom.selectSingleNode("//na:root");
alert("a:root: \n"+node.xml);

node = dom.selectSingleNode("//branch");
alert("branch: \n"+node.xml);

node = dom.selectSingleNode("//na:branch");
alert("a:branch: \n"+node.xml);

node = dom.selectSingleNode("//nb:branch");
alert("b:branch: \n"+node.xml);

function alert(str)
{
  WScript.echo(str+"\n");
}
Try It!

  1. Copy example.xml and example.js onto your local drive.

  2. Open a command prompt and navigate to the directory where example.xml and example.js are located.

  3. Type the following command from the command prompt:

    Cscript example.js

You should get the following output.

ns:(before setProperty())

ns:(after setProperty())

xmlns:na='http://myserver.com' xmlns:nb='http://yourserver.com'

root:

<root>

<branch>branch</branch>

<a:root xmlns:a="http://myserver.com">

<a:branch>a-branch</a:branch>

<b:branch xmlns:b="http://yourserver.com">

b-branch

</b:branch>

</a:root>

</root>

a:root:

<a:root xmlns:a="http://myserver.com">

<a:branch>a-branch</a:branch>

<b:branch xmlns:b="http://yourserver.com">

b-branch

</b:branch>

</a:root>

branch:

<branch>branch</branch>

a:branch:

<a:branch xmlns:a="http://myserver.com">a-branch</a:branch>

b:branch:

<b:branch xmlns:b="http://yourserver.com">

b-branch

</b:branch>

Visual Basic

domObj.setProperty
(strProp, strVal)  
strVal= domObj.getProperty
(strProp)

C\C++

HRESULT setProperty(BSTR strProp, VARIANT strVal);  
HRESULT getProperty(BSTR strProp, VARIANT* strVal);

Parameters

strProp
A BSTR string whose value is "SelectionNamespaces".

strVal
A VARIANT string containing a space-separated list of namespace declaration attributes.

Remarks

When an XML document contains elements defined in an external namespace, you must use this property to specify that namespace in order to use DOM methods such as selectNodes or selectSingleNode to navigate the document.

Versioning

This property is supported in MSXML 3.0 and 6.0. The default value is "".

Applies to

Interface: IXMLDOMDocument2

Method: setProperty | getProperty