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AppML Elements

With AppML, you will describe your application elements using XML.

AppML Elements

With AppML, all application elements are described using standard XML.

A predefined set of XML tags are used to describe files, documents, databases or database content, input forms, reports, queries, functions, menus, and a lot more.

Please take a closer look at the examples below:

A CD Catalog Stored in a Database:

Example 1: A Database Element

AppML uses an <appml> document to describe a selection of data from the database:

<appml>

<database>
  <connection>music_db</connection>
  <sql>
  Select title,artist,year from cd_catalog
  </sql>
</database>

</appml>

Note that the description is written in standard XML. Also note that AppML uses SQL to describe a selection from a database table.

Example 2: A Form Element

AppML can use a <form> element to describe an XHTML input form.

<form>
<table border="0" width="100%">

<tr>
<td>Title:</td>
<td><input size="30" id="title" value="" /></td>
</tr>

<tr>
<td>Artist:</td>
<td><input size="30" id="artist" value="" /></td>
</tr>

<tr>
<td>Year:</td>
<td><input size="4" id="year" value="" /></td>
</tr>

</table>
</form>

Note that the description is written in standard XHTML. Also note that AppML uses the id attribute to identify the input fields.

AppML Separates Data from Process

In application development, it is vital to separate the data from the processes that act on the data.

It is important to understand that the element descriptions from the two examples above cannot do anything. AppML has to rely on a separate Web Service to connect to a database and execute the selection. AppML also has to rely on a Web Service to execute the application input form.

With AppML, all application elements are described using AppML, but the application itself is executed by a collection of different Web Services.

You can read more about AppML Web Services in the next chapter.

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