Published: Sun, May 28, 2017
World | By Tasha Manning

XML Namespaces


In this case, the XML namespaces are defined by the developer.

This XML carries HTML table information:

This XML carries information about a table (a piece of furniture):

& lt; table & gt; & Lt; name & quot; African Coffee Table & lt; / name & gt; & Lt; width & gt; 80 & lt; / width & gt; & Lt; length & gt; 120 & lt; / length & gt;

If these XML fragments were added together, there would be a name conflict. Both contain a & lt; table & gt; Element, but the elements have different content and meaning.

A user or an XML application will not know how to handle these differences.

Solving the Name Conflict Using a Prefix

Table & gt; & Lt; h: tr & gt; & Lt; h: td & gt; Apples & lt; / h: td & gt; & Lt; h: td & gt; Bananas & lt; / h: td & gt; & Lt; / h: tr & gt; & Lt; / h: table & gt; & Lt; f: table & gt; & Lt; f: name & quot; African Coffee Table & lt; / f: name & gt; & Lt; f: width & gt; 80 width & gt; & Lt; f: length & gt; 120 length & gt; & Lt; / f: table & gt;

In the above example, there will be no conflict because the two

XML Namespaces - The xmlns Attribute When using prefixes in XML, the namespace is the prefix must be defined.

The namespace declaration has the following syntax.

The namespace declaration has the following syntax. Xmlns: prefix = "URI" .

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In the example above:

The xmlns attribute in the first & lt; table & gt; Element gives the h: prefix to qualified namespace.

The xmlns attribute in the second

Namespaces can also be used to create namespaces in the same way as namespaces.

xmlns: h = "http://www.w3.org/TR/html4/" xmlns: f = "https: // Www.w3schools.com/furniture"> & Lt; h: table & gt; & Lt; h: tr & gt; & Lt; h: td & gt; Apples & lt; / h: td & gt; & Lt; h: td & gt; Bananas & lt; / h: td & gt; & Lt; / h: tr & gt; & Lt; / h: table & gt; & Lt; f: table & gt; & Lt; f: name & quot; African Coffee Table & lt; / f: name & gt; & Lt; f: width & gt; 80 width & gt; & Lt; f: length & gt; 120 length & gt; & Lt; / f: table & gt; & Lt; / root & gt;

Note: The URI namespace is not used by the parser to look up information.

The purpose of using an URI is to give the namespace a unique

However, companies often use the namespace as a pointer to a webpage containing namespace information.

Uniform Resource Identifier (URI)

A Uniform Resource Identifier (URI) is a string of characters which identifies an Internet Resource.

The most common URI is the Uniform Resource Locator (URL) which identifies An Internet domain address. URI is the Universal Resource Name (URN).

Default Namespaces

Defining a default namespace for an element saves us from Using prefixes in all the child elements. It has the following syntax:

This XML carries information about a piece of furniture:

XSLT is a language that can be used to transform XML documents into other formats.

The XML document below, is a document used to transform XML into HTML. "Http://www.w3.org/1999/XSL/Transform" tags XSLT elements inside an HTML document:

? & Gt;
& lt; xsl: template match = "/" & gt; & Lt; html & gt; & Lt; body & gt; & Lt; h2 & gt; My CD Collection & lt; / h2 & gt; & Lt; table border = "1" & gt; & Lt; tr & gt; & Lt; th style = "text-align: left" & gt; Title & lt; / th & gt; & Lt; th style = "text-align: left" & gt; Artist & lt; / th & gt; & Lt; / tr & gt;

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