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<rg:gravatar ... >
==========================
		
Example 01: Just the URI
#("<")#img src="<rg:gravatar email="bob@bob.com" />" width="80" height="80" alt="Gravatar">
Note: By using the runtime expression, we trick Caché into thinking that the RULE is _NOT_ being wrapped by an HTML image tag. Ugh!
		
Example 02: Simple image tag
<rg:gravatar email="bob@bob.com" image="true" attributes="alt|Gravatar image" />
		
Example 03: Full meal deal
<rg:gravatar email="bob@bob.com" image="true" size="50" default="identicon" rating="pg" attributes="alt|Gravatar image, class|fooClass, id|fooId" xhtml="true" />

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Attributes:
==========================

email: The email address. Required.
size: Size (in pixels), defaults to 80(px) [ 1 - 512 ] (omit the px).
default: Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]. Default is the Gravatar image.
rating: Maximum rating (inclusive) [ g | pg | r | x ]. Default is 'g'.
image: 'True' to return a complete IMG tag. Default is just the URI.
attributes: Delimited attributes to include in the IMG tag. Format: 'attribute|value, ...'.
xhtml: 'True' to return a valid XHTML IMG tag.