<alt-text>

The <alt-text> element is allowed inside either <startflag> or <endflag> to provide alternate text for an image when the @imageref attribute sets an image to be used for flagging. When no alternate text is specified for a revision flag, the default alternate text for <revprop> start of change is a localized translation of "Start of change", and the default alternate text for <revprop> end of change is a localized translation of "End of change".