<startflag>
The <startflag> takes an optional image reference and an optional
         <alt-text> element for identifying the beginning of flagged content. If an
         image is specified, the specified image will be used to flag the beginning of the
         content, with
         the <alt-text> contents as alternative text. If
         <alt-text> is specified without an image, that text will be used to flag
         the content instead of an image. If no image and no <alt-text> are
         specified, then this element has no defined purpose. The <startflag>
         element is allowed inside either <prop> or
         <revprop>.
      
      Contains
alt-text (optional)
Contained by
Example
See the example in the <val> description.
Attributes
The following attribute is available on this element:
- @imageref
 - Provides a URI reference to the image file, using the same syntax as the @href attribute. See The @href attribute for information on supported values and processing implications.