Gravel is a supplementary JSF component/tag library for Facelets.  It should 
work with or without Seam (it was not designed for Seam specifically).  It does 
not provide widget-style components like RichFaces; instead it provides more 
basic "structural" and utility components.

For example, there is a tag to allow standard JSF action listeners to be run at 
response rendering time; there is a tag for grabbing request parameters and 
assigning them to EL expressions (with an optional converter); there are tags 
for access role checking, properties file handing, reading JSF messages into 
collections, session management, etc.

Also there is a set of tags that are "wrappers" around standard HTML tags, but 
provide the advantages of components: optional rendering using the standard 
rendered="", the option to render the content without the tag based on EL, JSF 
ID management (including handling ID lookup for HTML tags that take an ID as 
their argument), etc.

There are action listeners that provide data-management functions like sorting 
and filtering, and pager support.  Also there are components that are 
equivalent to h:dataTable and ui:repeat, but they evaluate at render-time, 
meaning that the state-saving and data visibility difficulties that plague 
these two components are eliminated.

Finally there is an (optional) alternative navigation handler that allows the 
developer to specify the navigation rules right in the XHTML, with the added 
benefit of being able to preserve JSF messages across redirects.  Also an 
(option) alternative view handler that preserves the original GET request 
parameters when looking up action URLs.

Gravel was conceived out of a set of components that were developed for the 
jBPM web console, but were not specific to jBPM.  I factored these components 
out and built on that.  My goal was to create a component library whose main 
goal was not yet another widget set (how many tab controls do you really need 
anyway?), but instead to provide a logical set of  components that are very 
basic functionality but yet are missing from the basic JSF component set.

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