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<h1 class="topictitle1">XML introduction</h1>
<div><p>Extensible Markup Language (XML) allows you to describe and organize
information in ways that are easily understandable by both humans and computers.
You can then share that information and its description with others over the
Internet, an extranet, network, or in other ways.</p>
<p>XML, like Standard Generalized Markup Language (SGML), is a metalanguage.
A metalanguage allows you to define a document markup language and its structure.
For example, both XML and Hypertext Markup Language (HTML) are derived from
SGML.</p>
<p>You can use XML to create your own markup language that includes a set
of rules and tags that describe information suited to your needs, for example,
name, title, address, and zip code. You define this markup language in a document
type definition (DTD) or XML Schema file that functions as the standard way
to describe your information. Using XML to share standardized information
means you are no longer required to write programs to focus on proprietary
software or convert and translate different data formats.</p>
<p>You and others can use the DTD or XML Schema definition to tag information
that you can then use in a variety of ways: printed on an address label, business
card, or stationary; displayed in a Web page; or sorted in a list of data
with similar attributes. For example, you might want to create an efficient
way to share information (such as purchase orders, shipping acknowledgments,
order status, and stock status) with your partners and suppliers. You can
use XML to share that information by creating and using XML documents that
conform to your DTD or XML Schema, in which you specify the standard for the
electronic exchange of information.</p>
<p>Although both XML and HTML use tags to describe content, they are also
very different:</p>
<ul><li>HTML describes how to format information for display and is meant for
computer-to-human interaction.</li>
<li>XML describes what the information is and is meant for computer-to-computer
interaction.</li>
</ul>
<p>There are many other sources of information regarding the advantages and
uses of XML that are readily available on the Internet and through commercial
publications. For a complete and comprehensive understanding of the capabilities
of XML, you should consult these sources.</p>
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<ul class="ullinks">
<li class="ulchildlink"><strong><a href="rzamjintroadvantages.htm">Advantages of XML</a></strong><br />
Using XML to exchange information offers many benefits.</li>
<li class="ulchildlink"><strong><a href="rzamjintrouses.htm">Uses of XML</a></strong><br />
XML has a variety of uses for Web, e-business, and portable applications.</li>
<li class="ulchildlink"><strong><a href="rzamjintrostandards.htm">XML standards and extensions</a></strong><br />
Other standards and extensions to XML work together to make your information more portable and useful. You need to know about these standards and extensions in order to do the following:</li>
</ul>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzamjmain.htm" title="The XML Toolkit for iSeries (licensed program offering (LPO) 5733-XT1) is designed to provide key development enablement components, XML parsers, to assist in the use of XML for general application or business-to-business (B2B) solutions. The XSL transformer allows you to reformat or reorganize XML documents to other formats (for example, XML or HTML).">XML Toolkit for iSeries</a></div>
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