[jboss-jira] [JBoss JIRA] Commented: (JBRULES-46) Prolog Style Query Based Backward Chaining

[Mark Proctor (JIRA)]

    [ https://jira.jboss.org/browse/JBRULES-46?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12542868#action_12542868 ] 

Mark Proctor commented on JBRULES-46:
-------------------------------------

We have something prototyped in trunk, but it's not exposed in the language yet. We are probably going to hold off from pushing this live until we update to a new algorithm around collection-oriented match, which won't have the recursion issues. We have started to spec out what the language would look like;
http://community.jboss.org/wiki/DroolsLanguageEnhancements

> Prolog Style Query Based Backward Chaining
> ------------------------------------------
>
>                 Key: JBRULES-46
>                 URL: https://jira.jboss.org/browse/JBRULES-46
>             Project: Drools
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>            Reporter: Mark Proctor
>            Assignee: Mark Proctor
>
> Forward Chaining means that facts are asserted and propgated forward throughout the network, during forward propagation matching takes place which results in rules being fired - the rules are event based, in that they are fired in response to changed in the working memory.
> Backward chaining is query based. Rules attempt to fire first but do not have the necessary matched facts, so facts are pulled in from an external source.

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