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<span lang="EN-US" style="font-size: 10pt; font-family: "Courier New";">Dear
All,<o:p></o:p></span>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">The
W3C Rule Interchange Format (RIF) Working Group recently published
"Last
Call" drafts of two of its specifications:<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
- "RIF Basic Logic Dialect" (BLD) specifies an XML format for rules<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
at an intermediate expressive power. The language is roughly<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
Horn rules with URIs, datatypes, and builtins. This goes beyond<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
datalog (it has function terms), it but does not provide any kind<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
of negation. (Various forms of negation, and other features,<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
are expected to be provided by dialects which extend BLD, to be<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
published in the future.)<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-bld/">http://www.w3.org/TR/rif-bld/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
- "RIF RDF and OWL Compatibility" explains and specifies how <st1:place
w:st="on">RIF</st1:place><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
rulesets are to be used in combination with RDF and OWL.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-rdf-owl/">http://www.w3.org/TR/rif-rdf-owl/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">LAST
CALL IS THE KEY TIME FOR EXTERNAL REVIEW. The designs are essentially
complete (the Working Group believes the design work is done), but
things can
still be changed in response to external input.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">Additionally,
input on editorial issues (especially pointing out<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">ambiguities)
is always welcome.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">In
addition to these Last Call documents, the Working Group has published
four
other drafts:<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
- RIF Production Rule Dialect (PRD) specifies an XML format for the<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
exchange of production rules. PRD and BLD are expected to be the<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
basis of the two main dialect-branches, with RIF Core being the<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
things in common between the two. (We have not yet published a<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
document expressing that intersection, but it can be inferred<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
from the PRD and BLD specifications.) This is a first public<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
working draft. This is an exellent time to comment on the<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
general direction of the language, and give feedback on all the<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
issues mentioned as Editor's Notes in the document.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-prd/">http://www.w3.org/TR/rif-prd/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
- RIF Framework for Logic Dialects (FLD) and <st1:place w:st="on">RIF</st1:place>
Datatypes and<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
Builtins (DTB) provide common elements for specific dialects to<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
use.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-fld/">http://www.w3.org/TR/rif-fld/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-dtb/">http://www.w3.org/TR/rif-dtb/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
- RIF Uses Cases and Requirements (UCR), last published about two<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
years ago, has been simplified and now has examples written in<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
the PRD and BLD presentation syntaxes. The examples can be<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
hidden or revealed using Javascript controls.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="http://www.w3.org/TR/rif-ucr/">http://www.w3.org/TR/rif-ucr/</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">Feedback
on all these documents should be sent to:<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">
<a href="mailto:public-rif-comments@w3.org">public-rif-comments@w3.org</a><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">All
comments (and responses to them) will be available at the public<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";">archive:<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";"> </span><span
lang="EN-US" style="font-size: 10pt; font-family: "Courier New";"><a
href="http://lists.w3.org/Archives/Public/public-rif-comments/"><span
lang="DE" style="">http://lists.w3.org/Archives/Public/public-rif-comments/</span></a></span><span
style="font-size: 10pt; font-family: "Courier New";"><o:p></o:p></span></p>
<p class="MsoNormal" style=""><span
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">Please
comment by 19 September so we have time to address your comments in
incorporate
any changes into our next round of publications.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p> </o:p></span></p>
<p class="MsoNormal" style=""><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"
style="font-size: 10pt; font-family: "Courier New";">Adrian Paschke<o:p></o:p></span></p>
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