Creating Elements with Simple Content and Attributes : simpleContent « XML Schema « XML Tutorial

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3. simpleContent

When declaring an element that has simple content, you start with a basic element declaration: 

<element name="phone"> 
    <!-- Specify type here --> 
</element> 

Within the element declaration, you include a <complexType> declaration in which you specify that you want your element to have simple content. 
You do this by creating a <complexType> declaration that contains a <simpleContent> element. 
The <simpleContent> element indicates that the <complexType> cannot contain child elements. 
It may contain attributes, but otherwise the content will be defined by a simple type.

<element name="phone"> 
    <complexType> 
        <simpleContent> 
            <!-- Specify type here --> 
        </simpleContent> 
    </complexType> 
</element> 

Within the <simpleContent> element, you can create an <extension> declaration. 
You must use an <extension> declaration because you will be extending an existing data type by adding attribute declarations. 

<element name="phone">
  <complexType>
    <simpleContent>
      <extension base="string">
        <attribute name="kind" type="string" default="Home" />
      </extension>
    </simpleContent>
  </complexType>
</element>


Any of the following examples are allowable <phone>elements based on the previous declaration: 

<phone kind="Home">001-909-555-1212</phone> 
<phone>001-909-555-1212</phone> 
<phone />