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XmlEntity.BaseURI Property

Gets the base Uniform Resource Identifier (URI) of the current node.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

public override string BaseURI { get; }

Property Value

Type: System.String
The location from which the node was loaded.

A networked XML document is comprised of chunks of data aggregated using various World Wide Web Consortium (W3C) standard inclusion mechanisms and therefore contains nodes that come from different places. The BaseURI tells you where these nodes came from.

The value of this property varies depending on the node type. Nodes which are children of external EntityReference nodes return the location of the entity itself. For example, consider the following XML document:

 <!DOCTYPE item [
 <!ENTITY xyz SYSTEM "a/b.xml">
 ]>
 <item num='123'>&xyz;</item>

where the external entity a/b.xml contains the XML text <test>123</test>.

If the document is loaded from http://server/mydata.xml, BaseURI returns the following:

NodeType

Name

BaseURI

Attribute

num

http://server/mydata.xml

Document

#document

http://server/mydata.xml

DocumentType

item

http://server/mydata.xml

Entity

xyz

http://server/mydata.xml

Element

item

http://server/mydata.xml

EntityReference

xyz

http://server/mydata.xml

Element

test

http://server/a/b.xml

Text

#text

http://server/a/b.xml

BaseURI looks for entity reference boundaries, so if entities are expanded, this information is not preserved and this property returns the location of the XmlDocument object in all cases.

As a second example, given the following XML document:

 <!DOCTYPE Mydata SYSTEM "http://localhost/doctype.dtd">
 <baa>&xyz;</baa>

where the document type definition (DTD) file contains the following:

 <!ENTITY xyz "<E1>My Data</E1>">
 <!ELEMENT baa #PCDATA>
 <!ATTLIST baa attr1 "woof">

If the XML document is loaded from http://localhost/mydata.xml, BaseURI returns the following for each of the nodes:

NodeType

Name

BaseURI

Document

#document

http://localhost/mydata.xml

DocumentType

Mydata

http://localhost/doctype.dtd

Element

baa

http://localhost/mydata.xml

Entity

xyz

http://localhost/doctype.dtd

EntityReference

xyz

http://localhost/mydata.xml

Attribute

woof

http://localhost/mydata.xml

NoteNote

The base URI of a default attribute is the same as the base URI of the element to which they belong.

This property is a Microsoft extension to the Document Object Model (DOM).

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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