The Sub Page widget.

Sometimes we want to conveniently create a link to a sub page. We could do this by using the syntax SuperPage.SubPage, but this is inconvenient. Instead we want to be able to say ^SubPage.

Page creator.
Page name.	Page contents.	Page attributes.	valid?
SuperPage	^SubPage		true

Response Requester.
uri	valid?	contents?
SuperPage	true

The widget should translate into a ? link of the form:

• ^SubPage<a href="SuperPage.SubPage?edit">?</a>

Response Examiner.
type	pattern	matches?	value
contents	\^SubPage<a href="SuperPage.SubPage\?edit">\?</a>	true

If the sub page is already present, then the widget should translate into a normal link.

Page creator.
Page name.	Page contents.	Page attributes.	valid?
SuperPage.SubPage	nothing		true

Response Requester.
uri	valid?	contents?
SuperPage	true

Response Examiner.
type	pattern	matches?	value
contents	<a href="SuperPage.SubPage">\^SubPage</a>	true