Joel,
My
$.02 on this discussion:….
Some
questions in reference to your statement below, “My life
would be made easier by something like CML, particularly if it had the
following characteristics: I’d like to see a mechanism for
specifying identity equivalence in the model (I think this is already do-able
with SML). I’d also like to see a way to add semantic hints (in an agreed
upon fashion) to property definitions in the model, so that I could use the
model to drive sensor identification and configuration and to decide how deal
with the sensor data. I think this could be easily done using schema
annotations, similar to the way the sml:key information is handled.”
·
What is the scope of the “model” you refer to? Is this
a model JUST for the Datacenter, or something more general? If it is the
latter (and I hope it is), what types of data / entities do you envision the
model covering?
·
Do you see this as being a COSMOS 2.0 item? Or sooner J ?
·
Would you be willing to share your use case, once you have it?
Please
note that there may be some interest from the CA end in regards to some sort of
an Information Model that comes from Open Source…
Also,
in one of your earlier emails below, you refer to “ontology
extraction from things like SML models”…. Pardon a silly question, but what does this
mean?
Thanks,
Jimmy Mohsin
Cell +1-609-635-1703
From:
cosmos-dev-bounces@xxxxxxxxxxx [mailto:cosmos-dev-bounces@xxxxxxxxxxx] On
Behalf Of Hawkins, Joel
Sent: Tuesday, May 27, 2008 2:10 PM
To: Cosmos Dev
Subject: RE: [cosmos-dev] Status of Datacenter SML example
Harm,
Thanks for the background on facets. Do you see any properties of a
type as being ‘intrinsic’, i.e. not belonging to a facet?
Looking at the datacenter example, the only one I see is item:name, which is
also used as an sml:key for all of the types (rack, cable, etc. all extends
item). I’m assuming that sml:key could be applied to complex types as
well as attributes? Could a facet (or some aspect of a facet) act as an sml:key?
Can you give an example of when you would use sml:acyclic=false? Is
this for the typical bill-of-materials scenario, or do the cycles refer to
instances rather than types?
Mark,
I’m working with some internal folks to get up a use case,
but principally it comes down to being able to import subsets of external model
definitions (initially as a type system, and then as instances), and to
associate instances in my internal representation with external sensor data
streams so that I can do live impact/root cause analysis, SLA monitoring,
etc. Some of the things I’m dealing with are identity
discrimination (basically identifying entities by sets of properties and/or
relationships to other entities), model mappings (we attach to many
technologies with different “world views”), time-series
identification, and concern separation (which is where the facet/capability
stuff comes into play). My life would be made easier by something like
CML, particularly if it had the following characteristics: I’d like
to see a mechanism for specifying identity equivalence in the model (I think
this is already do-able with SML). I’d also like to see a way to add
semantic hints (in an agreed upon fashion) to property definitions in the
model, so that I could use the model to drive sensor identification and
configuration and to decide how deal with the sensor data. I think this
could be easily done using schema annotations, similar to the way the sml:key
information is handled.
Cheers,
Joel
-----Original Message-----
From: cosmos-dev-bounces@xxxxxxxxxxx
[mailto:cosmos-dev-bounces@xxxxxxxxxxx] On Behalf Of Harm Sluiman
Sent: Tuesday, May 27, 2008 9:04 AM
To: Cosmos Dev
Subject: Re: [cosmos-dev] Status of Datacenter SML example
facets were
intended to create what would in effect be change units of work based on access
patterns and roles. They were intended to allow overlapping (however avoid it
if at all possible), but basically no content could be enabled without being in
at least one facet. This is sort of, but not exactly like capabilities.
In SML we
discussed the concepts of requirements and capabilities as the data driven
constraint mapping to associated artifacts/resources. Capabilities are
basically the visible properties of a resource that can be consumed or used as
a match to a requirement. For example a "blade" may surface the
memory it has, and the operating system may declare the amount of memory it
requires. The genics constraint tests/maps the requirement of 500 meg to
a capability of 2 gig.
The intent is
that a minimal number of basic Schematron constraints could be provided that
dynamically matched requirements to capabilities. This in turn implies that
they be specified in a rigorous fashion and be relatively strongly typed.
Grouping of capabilities into facets would greatly aid this scenario.
So facets
basically were intended to provide a grouping mechanism to optimize access
patterns and reduce searching. This did not make it into the SML specification,
and is now proposed for CML.
I hope this
helps.
Thanks for your time.
________________
Harm Sluiman,
IBM DE / Technical Executive
phone:905-413-4032 fax: 4920 cell: 1-647-300-4758
mailto:sluiman@xxxxxxxxxx
Admin : Queenie Lam qlam@xxxxxxxxxx Tie: 313-5864 1-905-413-5864
|
Mark
D Weitzel <weitzelm@xxxxxxxxxx>
Sent by:
cosmos-dev-bounces@xxxxxxxxxxx
05/27/2008
08:05 AM
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Please respond to
Cosmos Dev <cosmos-dev@xxxxxxxxxxx>
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Re:
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joel,
would you be kind enough to provide an example of what you are looking for?
from reading your note, it sounds to me that you are making the same leap as
me, e.g. facets are roughly equal to a capability. and you want to have
somehting like the RMD where you can "decorate" a property with
additional info, a la metrics. it would be good to get something like
this, and a use case in front of the RM people.
as for a use case, we would want to tie this together with a CMDBf scenario,
e.g. i need to query a CMDB for information about a resource so that i can
understand which properties i want to monitor or something like that.
if you could structure an example with the data center, then ali and i could
review it with the folks from IBM that are working on data model activities.
-mw
_______________________________________________________________________________________________________________
Mark Weitzel | STSM | IBM Software Group | Tivoli | Autonomic Computing | (919)
543 0625 | weitzelm@xxxxxxxxxx
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Re:
[cosmos-dev] Status of Datacenter SML example
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Ali Mehregani
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Joel,
I'm not aware how the CML workgroup is progressing. You'll have to look
around to see if the workgroup is taking input from the general public.
The example you note below is a language detail that belongs more in SML
than CML. The latter is just instances of SML used to model resources.
Thanks,
Ali Mehregani
Phone Number: (905) 413-3712
Service Modeling Language - COSMOS
http://www.eclipse.org/cosmos/
Thanks Ali. I really like the facet concept, both as an organizing
principle and as a means of capturing and retaining separate concerns. I hope
it makes it into CML.
Are any other conventions going to go into CML (that you can talk
about)? For instance, XMLSchema and SML give a model designer the ability to
denote identity requirements – would it be possible to standardize on
some additional annotations to decorate models to distinguish between
descriptive attributes and time-sensitive attributes (for example)?
Cheers,
Joel
-----Original
Message-----
From: cosmos-dev-bounces@xxxxxxxxxxx [mailto:cosmos-dev-bounces@xxxxxxxxxxx] On Behalf Of Ali
Mehregani
Sent: Thursday, May 22, 2008 9:37 PM
To: cosmos-dev@xxxxxxxxxxx
Subject:
Re: [cosmos-dev] Status of Datacenter SML example
Hi Joel,
The concept of facets is purely COSMOS. There is a possibility for a
similar concept to be incorporated in Common Model Language (CML) but no such
thing exists in SML.
Thanks,
Ali Mehregani
Phone Number: (905) 413-3712
Service Modeling Language - COSMOS
http://www.eclipse.org/cosmos/
Joel,
To get some examples for all the various SML syntactical elements, you should
check out our test suite. Go to testing/org.eclipse.cosmos.rm.validation.tests
and look in the test resources folder.
I'll have to look into your facet question and get back to you. Valentina
and Harm created the data center example, and to be honest, I never understood
the purpose of the facet elements we have in there.
David
---
David Whiteman | Tivoli Autonomic Computing
Eclipse COSMOS project committer | http://www.eclipse.org/cosmos/
david_whiteman@xxxxxxxxxx | 919-254-8224 | T/L
444-8224
Hi David,
Thanks for the reply. I'm working on an internal project (that has
taken me away from COSMOS and appears to be bringing me back) that involves
ontology extraction from things like SML models – so I figured hey, why
not start with our COSMOS example?
A couple of other things I noticed in there – we're not
making use of any of the identity capabilities in the SML schema (or from XSD,
for that matter). Any reason for that? Can I get a xsd:unique up in here? ;-)
Also, is the facet concept purely a COSMOS thing? I was under the
impression that it was part of the SML effort, but I don't see it anywhere in
the spec. The concept seemed to align well with WSDM's capability model, and
fits well the whole separation of concerns thing, but it appears to be a
best-practices recommendation. Is that the case?
Thanks,
Joel
-----Original
Message-----
From: cosmos-dev-bounces@xxxxxxxxxxx [mailto:cosmos-dev-bounces@xxxxxxxxxxx] On Behalf Of David
Whiteman
Sent: Thursday, May 22, 2008 4:17 PM
To: Cosmos Dev
Subject: Re: [cosmos-dev] Status of Datacenter SML example
Hi Joel,
Yes, they are supposed to validate. The project itself should contain
correct SML code, and should be up to date for the 1.1 level of the SML spec.
That said, it appears our validator has some problems currently with that
sample. We have an open defect targeted for i11 that will hopefully
address some or all of these issues:
http://bugs.eclipse.org/228223
Add yourself to the cc: list if you want to keep informed on progress.
Might I ask what you're looking at SML for? I didn't know you had an
interest in it.
Regards,
David
---
David Whiteman | Tivoli Autonomic Computing
Eclipse COSMOS project committer | http://www.eclipse.org/cosmos/
david_whiteman@xxxxxxxxxx | 919-254-8224 | T/L
444-8224
Howdy y'all.
Can
someone tell me what the status of the org.eclipse.cosmos.rm.example.datacenter
project is? I'm (finally) trying to get back into COSMOS, and I need some
sample SML documents to play with. When I run the datacenter documents through
the Resource Modeling validator I get a number of errors (occasional missing
type constraints, doesn't like xml:lang, can't find it:facetType(!)). Should
these documents validate?
Thanks,
Joel
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Ali Mehregani
COSMOS Project
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