3:20 p.m.
Hi!
I am trying to leverage/integrate the XML knowledge bases and rules with more mainstream
programming tools and environments, like Drools. And therefore it would be nice to know
the state-of-the-art of XML rule language in Drools.
As far as I understand, that up to the version 5.3 Drools supported 2 external languages
(XML and DRL) that were mapped to the internal language, then the support for XML was
dropped. Here is nice discussion about possible XML rule language and Drools:
http://drools.46999.n3.nabble.com/Enhancements-to-Rule-XML-BRL-td1082068....
I have several question regarding XML rule language:
1) what is the development status of it, specifically - does Drools really support
standart RuleML? Here http://wiki.ruleml.org/index.php/RuleML_Implementations Drools is
cited as the implementaton of RuleML but is is really so? At least Drools documentation
does not say so. There is third-party translation tool available
http://docs.codehaus.org/display/LOGICABYSS/RuleML2DroolsTranslator but is this sufficient
for using RuleML with Drools?
2) Are there any suggestions or ideas for the implementation of RuleML translation to
Drools internal language? Maybe it can be done in a straigtforward manner, but I feel that
there should be some more formal solution. I.e. XML rule languages have formal syntax and
apparently Drools internal language has formal syntax as well. If we could endow those
languages with the formal semantics as well then the translation could be done in
meta-level. I.e., maybe there are tools that can help to specify formal operational
semantics for the formally given programming languages and then provide support for the
translation in at this - more general level?
I would be glad to hear any suggestions or ideas about this.
Thanks!
Tom
3:33 p.m.
BRL was only ever really an XStream dump of the object model used by the
UI. IMO it would be over-selling it to suggest it was ever a generic XML
rule language.
BRL was dropped in 6.x as rules are by and large stored as DRL and we
rehydrate the UI object model from that when editing in the UI (there are a
couple of cases where we continue to store guided decision tables and
guided rule templates as an XStream dump of their respective UI object
models but they too will die).
Mark Proctor may be able to elaborate on the future of Drools and an XML
language. He is however travelling at the moment and may be delayed
replying.
Sent on the move
On 5 Mar 2014 21:20, "Tom Rhodes" <tom.rhodes(a)gmx.com> wrote:
9:49 a.m.
There is currently no supported drools xml language. As per michael’s details about how we
have deprecated any previous xml languages.
We keep discussing trying to find time to do RuleML, but we always fall short of time :(
Mark
On 5 Mar 2014, at 21:33, Michael Anstis <michael.anstis(a)gmail.com> wrote:
10:33 a.m.
To clarify on Mark's statement:
Drools has deprecated any other XML format **for the serialization of DRL**.
As time allows, we are actually trying to expand the number and scope of
supporting
languages, such as PMML or OWL, regardless of their serialization.
Davide
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10:30 a.m.
Tom, timely request!
I am investigating the specific problem even as we speak, for a research
we're doing with Monica Palmirani. As Mark said, there is no support yet,
but just for lack of time, but investigating.
Given its nature and the execution semantics, Drools would be a more likely
candidate for Reaction RuleML rather than Deliberation RuleML. However,
LegalRuleML is my target as of today.
In fact, Mark and I are building capabilities (defeasibility, modalities,
metadata in general, plans for
a new fact model) that would support the semantics of (Legal)RuleML.
As for the translation itself, what we typically do is parse the XML
document using JaxB to create
an OO typed AST. Then, we visit the AST and use rule templates to
instantiate the DRL which
can be consumed by the engine.
If you are interested, we could collaborate.
Best
Davide
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4 comments
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participants (4)
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Davide Sottara -
Mark Proctor -
Michael Anstis -
Tom Rhodes