You can set properties within the site category as required or read only. Using view mapping to set a property as required, add a required attribute and set the attribute to true. To set a property as read only set the isReadOnly property to true. The following is an example of both property specifications:

<!--You can define this once, and reuse it for any property that you want to mark
    as required-->

<add-item item-descriptor="propertyViewAttributeDefinition"
    id="SaPvRequiredTrue">
  <set-property name="defaultValue"><![CDATA[true]]></set-property>
</add-item>

<!-- Using Description as an example – note the required attribute, and
    the isReadOnly property-->
<add-item item-descriptor="propertyView" id="SaPvSiteDescription">
  <set-property name="name"><![CDATA[Site Description
    propertyView]]></set-property>
  <set-property name="description"><![CDATA[Site Description
    propertyView]]></set-property>
  <set-property name="mode"><![CDATA[AmMmDef]]></set-property>
  <set-property name="type"><![CDATA[string]]></set-property>
  <set-property name="viewComponent"><![CDATA[atg.editor.view
    property.DefaultEditor]]></set-property>
  <set-property name="isComponentPropertyView"><![CDATA[false]]>
    </set-property>
  <set-property name="isDefault"><![CDATA[false]]></set-property>
  <set-property name="isReadOnly"><![CDATA[true]]></set-property>
  <set-property name="attributes"><![CDATA
    [inputFieldMaxlength=AmPvadIntInputFieldMaxLength,
    inputFieldMaxWidth=AmPvadIntInputFieldMaxWidth,
    required=SaPvRequiredTrue]]></set-property>
</add-item>

Important: To configure a property, it is best that you add the properties in the view mapping, and not the repository. Any modifications to properties that you make in the repository will apply to all sites.