The following controls MUST contain the CtrlId attribute in their XSLT representation:

Hyperlink controls (section can contain this attribute in their XSLT representation.

The value of the CrtlId attribute MUST range from 1 through 255 characters, MUST begin with an alphabetic character and MUST contain only alphanumeric and underscore characters.

The value of this attribute SHOULD be unique for each button control and picture button control in the form.

The following W3C XML Schema ([XMLSCHEMA1] section 2.1) fragment specifies the contents of this element.

 <xsd:element name="CtrlId" type="xsd:string"/>