Home » Modeling » EMF » Using UML Profiles with EMF
| Using UML Profiles with EMF [message #427194] |
Thu, 05 February 2009 13:20  |
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Hi,
As a part of our modelling efforts for ORMF the use or UML Profiles has been
brought up as a possible strategy to enable adopters to extend our core
model. Since the architectural decision to use EMF has already been made, I
started researching how one goes about applying UML Profiles to an ecore
model. So far am not encouraged from my initial Googling, checking the EMF &
the DSL book and searches on the relevant EF newsgroups.
So I would like to ask this forum for their collective wisdom. Is using UML
Profiles with EMF a good or bad idea. If it is a good idea, I would
appreciate pointers to any relevant resources to better understand how to
marry the two.
Many thanks,
Joel
--
Joel Rosi-Schwartz
Etish Limited [http://www.etish.org]
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^...^
/ o,o \ The proud parents of Useme & ORMF
|) ::: (| Open Requirements Management Framework
====w=w==== [http://www.eclipse.org/ormf/]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| Re: Using UML Profiles with EMF [message #427197 is a reply to message #427194] |
Thu, 05 February 2009 14:00  |
Eclipse User |
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Originally posted by: cdamus.zeligsoft.com
Hi, Joel,
(including the UML2 newsgroup for their perspective)
The MDT UML2 component has been quite successful with their
implementation of Profiles for UML. Also, it's possibly a little-known
fact, but the Profile mechanism is applicable to any UML-based
metamodel, not just the UML, itself. The UML2 run-time library supports
this in any generated metamodel.
So, because Ecore can be described using UML (see the
Ecore.metamodel.uml resource in UML2), one can, in theory, generate
Ecore with profile support. :-D Of course, it's probably best to leave
Ecore to describe itself.
In my own experience, the stereotype mechanism of Profiles offers a very
convenient extension facility which readily supports:
- optionality: the base model element has no reference to the
stereotypes, so stereotypes don't even have to be loaded if
the application doesn't need them
- traceability: UML2 offers the implicit CacheAdapter instance that
facilitates the retrieval of stereotypes applied to an object
- transparency: languages such as OCL have built-in support for
stereotypes because they behave in every respect like additional
metaclasses
- type safety: stereotypes are more explicitly structured than
EAnnotations, and with UML2's static profile definition, can even
have behaviour of their own
It's basically a clean implementation of the classic Adapter/Decorator
pattern, for models. Profiles in themselves are a good reason to use
UML2 and its code generation for your metamodels. Just define your
metamodel with support for stereotype extension, and any client
application can define domain-specific extensions to your metamodel
without the encumbrance of the tight coupling implied by metaclass
specialization.
HTH,
Christian
Joel Rosi-Schwartz wrote:
> Hi,
>
> As a part of our modelling efforts for ORMF the use or UML Profiles has been
> brought up as a possible strategy to enable adopters to extend our core
> model. Since the architectural decision to use EMF has already been made, I
> started researching how one goes about applying UML Profiles to an ecore
> model. So far am not encouraged from my initial Googling, checking the EMF &
> the DSL book and searches on the relevant EF newsgroups.
>
> So I would like to ask this forum for their collective wisdom. Is using UML
> Profiles with EMF a good or bad idea. If it is a good idea, I would
> appreciate pointers to any relevant resources to better understand how to
> marry the two.
>
> Many thanks,
> Joel
>
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| Re: Using UML Profiles with EMF [message #427198 is a reply to message #427194] |
Thu, 05 February 2009 14:00 |
 Ed Merks
Messages: 33133
Registered: July 2009 |
Senior Member |
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Joel,
UML profiles make sense to apply to UML instances, but Ecore doesn't
directly have such a concept and I suspect you might even be asking how
to make your own model extensible without other people literally
extending the classes in your model. You'll see I often tell people not
to extend Ecore (and that they often ignore me only to complain later).
I tell them that instead they should decorate Ecore with EAnnotations.
Often people notice how conveniently EModelElement already supports
EAnnotations and are tempted to extend it in their model; please don't.
One of the cool things about EAnnotations is that they can contain or
reference any other type of object, so they can be used to embed or
reference data from other independent models. So this is the Ecore
equivalent of a profile and these concepts could be reused in the design
of your own model. I.e., define a root class that all your other
classes extend (like EModelElement in Ecore), define an annotation class
(like Annotation) and use it on your root class. This will effectively
make all parts of your model annotatable...
Joel Rosi-Schwartz wrote:
> Hi,
>
> As a part of our modelling efforts for ORMF the use or UML Profiles has been
> brought up as a possible strategy to enable adopters to extend our core
> model. Since the architectural decision to use EMF has already been made, I
> started researching how one goes about applying UML Profiles to an ecore
> model. So far am not encouraged from my initial Googling, checking the EMF &
> the DSL book and searches on the relevant EF newsgroups.
>
> So I would like to ask this forum for their collective wisdom. Is using UML
> Profiles with EMF a good or bad idea. If it is a good idea, I would
> appreciate pointers to any relevant resources to better understand how to
> marry the two.
>
> Many thanks,
> Joel
>
>
Ed Merks
Professional Support: https://www.macromodeling.com/
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| Re: Using UML Profiles with EMF [message #427210 is a reply to message #427194] |
Thu, 05 February 2009 22:17 |
Hossam Karim
Messages: 26
Registered: July 2009 |
Junior Member |
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------------akGYRa3d2y0AKQRnR4Xxpu
Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-1
Content-Transfer-Encoding: 7bit
Hi Joel,
We are facing this typical scenario in one of our projects. We started
by not listening to Ed?s advice and extended the Ecore metamodel. Now
that we realized we were wrong, we are investigating a different approach.
A profile is an extension mechanism, and Ecore metamodel is basically
architected to be instantiated by creating your own models. So, if you are
able to create an Ecore model that describes precisely your domain model,
what maps a profile is an extension to your Ecore model. Please have a
look at the attached diagram.
Hossam Karim
On Thu, 05 Feb 2009 15:20:43 +0200, Joel Rosi-Schwartz
<Joel.Rosi-Schwartz@etish.org> wrote:
> Hi,
>
> As a part of our modelling efforts for ORMF the use or UML Profiles has
> been
> brought up as a possible strategy to enable adopters to extend our core
> model. Since the architectural decision to use EMF has already been
> made, I
> started researching how one goes about applying UML Profiles to an ecore
> model. So far am not encouraged from my initial Googling, checking the
> EMF &
> the DSL book and searches on the relevant EF newsgroups.
>
> So I would like to ask this forum for their collective wisdom. Is using
> UML
> Profiles with EMF a good or bad idea. If it is a good idea, I would
> appreciate pointers to any relevant resources to better understand how to
> marry the two.
>
> Many thanks,
> Joel
>
------------akGYRa3d2y0AKQRnR4Xxpu
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------------akGYRa3d2y0AKQRnR4Xxpu--
|
|
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| Re: Using UML Profiles with EMF [message #427226 is a reply to message #427197] |
Fri, 06 February 2009 18:26 |
|
Hi Christian,
I am not clear from you post if you are suggesting a way to use Profiles in
conjunction with EMF or if you are simply arguing that Profiles have
features that are difficult to achieve with EMF. Would you care to clarify?
Many thanks,
Joel
On 05/02/2009 14:00, in article gmerdl$kdj$1@build.eclipse.org, "Christian
W. Damus" <cdamus@zeligsoft.com> wrote:
> Hi, Joel,
>
> (including the UML2 newsgroup for their perspective)
>
> The MDT UML2 component has been quite successful with their
> implementation of Profiles for UML. Also, it's possibly a little-known
> fact, but the Profile mechanism is applicable to any UML-based
> metamodel, not just the UML, itself. The UML2 run-time library supports
> this in any generated metamodel.
>
> So, because Ecore can be described using UML (see the
> Ecore.metamodel.uml resource in UML2), one can, in theory, generate
> Ecore with profile support. :-D Of course, it's probably best to leave
> Ecore to describe itself.
>
> In my own experience, the stereotype mechanism of Profiles offers a very
> convenient extension facility which readily supports:
>
> - optionality: the base model element has no reference to the
> stereotypes, so stereotypes don't even have to be loaded if
> the application doesn't need them
> - traceability: UML2 offers the implicit CacheAdapter instance that
> facilitates the retrieval of stereotypes applied to an object
> - transparency: languages such as OCL have built-in support for
> stereotypes because they behave in every respect like additional
> metaclasses
> - type safety: stereotypes are more explicitly structured than
> EAnnotations, and with UML2's static profile definition, can even
> have behaviour of their own
>
> It's basically a clean implementation of the classic Adapter/Decorator
> pattern, for models. Profiles in themselves are a good reason to use
> UML2 and its code generation for your metamodels. Just define your
> metamodel with support for stereotype extension, and any client
> application can define domain-specific extensions to your metamodel
> without the encumbrance of the tight coupling implied by metaclass
> specialization.
>
> HTH,
>
> Christian
>
>
> Joel Rosi-Schwartz wrote:
>> Hi,
>>
>> As a part of our modelling efforts for ORMF the use or UML Profiles has been
>> brought up as a possible strategy to enable adopters to extend our core
>> model. Since the architectural decision to use EMF has already been made, I
>> started researching how one goes about applying UML Profiles to an ecore
>> model. So far am not encouraged from my initial Googling, checking the EMF &
>> the DSL book and searches on the relevant EF newsgroups.
>>
>> So I would like to ask this forum for their collective wisdom. Is using UML
>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>> appreciate pointers to any relevant resources to better understand how to
>> marry the two.
>>
>> Many thanks,
>> Joel
>>
--
Joel Rosi-Schwartz
Etish Limited [http://www.etish.org]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^...^
/ o,o \ The proud parents of Useme & ORMF
|) ::: (| Open Requirements Management Framework
====w=w==== [http://www.eclipse.org/ormf/]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
| Re: Using UML Profiles with EMF [message #427227 is a reply to message #427198] |
Fri, 06 February 2009 18:31 |
|
Hi Ed,
Thanks for the clear reply.
On point I would appreciate if you could clarify. You say:
I tell them that instead they should decorate Ecore with EAnnotations.
I you suggesting that ORMF also discourage adopters from extending our Core
model?
Cheers,
Joel
On 05/02/2009 14:00, in article gmereo$kfv$1@build.eclipse.org, "Ed Merks"
<Ed.Merks@gmail.com> wrote:
> Joel,
>
> UML profiles make sense to apply to UML instances, but Ecore doesn't
> directly have such a concept and I suspect you might even be asking how
> to make your own model extensible without other people literally
> extending the classes in your model. You'll see I often tell people not
> to extend Ecore (and that they often ignore me only to complain later).
> I tell them that instead they should decorate Ecore with EAnnotations.
> Often people notice how conveniently EModelElement already supports
> EAnnotations and are tempted to extend it in their model; please don't.
> One of the cool things about EAnnotations is that they can contain or
> reference any other type of object, so they can be used to embed or
> reference data from other independent models. So this is the Ecore
> equivalent of a profile and these concepts could be reused in the design
> of your own model. I.e., define a root class that all your other
> classes extend (like EModelElement in Ecore), define an annotation class
> (like Annotation) and use it on your root class. This will effectively
> make all parts of your model annotatable...
>
>
> Joel Rosi-Schwartz wrote:
>> Hi,
>>
>> As a part of our modelling efforts for ORMF the use or UML Profiles has been
>> brought up as a possible strategy to enable adopters to extend our core
>> model. Since the architectural decision to use EMF has already been made, I
>> started researching how one goes about applying UML Profiles to an ecore
>> model. So far am not encouraged from my initial Googling, checking the EMF &
>> the DSL book and searches on the relevant EF newsgroups.
>>
>> So I would like to ask this forum for their collective wisdom. Is using UML
>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>> appreciate pointers to any relevant resources to better understand how to
>> marry the two.
>>
>> Many thanks,
>> Joel
>>
>>
--
Joel Rosi-Schwartz
Etish Limited [http://www.etish.org]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^...^
/ o,o \ The proud parents of Useme & ORMF
|) ::: (| Open Requirements Management Framework
====w=w==== [http://www.eclipse.org/ormf/]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
| Re: Using UML Profiles with EMF [message #427228 is a reply to message #427210] |
Fri, 06 February 2009 18:34 |
|
Hi Hossam,
Thanks for sharing your experience and for the helpful diagram. Have you
actually achieved all or part the of transformations that you indicate? I
would be keen to follow your progress with this.
All the best,
Joel
On 05/02/2009 22:17, in article op.uowf6zvihvsg55@hkarim, "Hossam Karim"
<hossam.karim@gmail.com> wrote:
> Hi Joel,
> We are facing this typical scenario in one of our projects. We started
> by not listening to Ed?s advice and extended the Ecore metamodel. Now
> that we realized we were wrong, we are investigating a different approach.
> A profile is an extension mechanism, and Ecore metamodel is basically
> architected to be instantiated by creating your own models. So, if you are
> able to create an Ecore model that describes precisely your domain model,
> what maps a profile is an extension to your Ecore model. Please have a
> look at the attached diagram.
>
>
> Hossam Karim
>
>
> On Thu, 05 Feb 2009 15:20:43 +0200, Joel Rosi-Schwartz
> <Joel.Rosi-Schwartz@etish.org> wrote:
>
>> Hi,
>>
>> As a part of our modelling efforts for ORMF the use or UML Profiles has
>> been
>> brought up as a possible strategy to enable adopters to extend our core
>> model. Since the architectural decision to use EMF has already been
>> made, I
>> started researching how one goes about applying UML Profiles to an ecore
>> model. So far am not encouraged from my initial Googling, checking the
>> EMF &
>> the DSL book and searches on the relevant EF newsgroups.
>>
>> So I would like to ask this forum for their collective wisdom. Is using
>> UML
>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>> appreciate pointers to any relevant resources to better understand how to
>> marry the two.
>>
>> Many thanks,
>> Joel
>>
>
--
Joel Rosi-Schwartz
Etish Limited [http://www.etish.org]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^...^
/ o,o \ The proud parents of Useme & ORMF
|) ::: (| Open Requirements Management Framework
====w=w==== [http://www.eclipse.org/ormf/]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
| Re: Using UML Profiles with EMF [message #427229 is a reply to message #427227] |
Fri, 06 February 2009 18:49 |
Ed Merks
Messages: 33133
Registered: July 2009 |
Senior Member |
|
|
This is a multi-part message in MIME format.
--------------060702090701090601010701
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Joel,
Comments below.
Joel Rosi-Schwartz wrote:
> Hi Ed,
>
> Thanks for the clear reply.
>
> On point I would appreciate if you could clarify. You say:
>
> I tell them that instead they should decorate Ecore with EAnnotations.
>
> I you suggesting that ORMF also discourage adopters from extending our Core
> model?
>
In the UML newsgroup they often talk about light weight extension
(profiling/decorating) verses heavy weight extension (subclasses).
It's fine to allow people to subclass, but such subclasses are more
intimately tied to the core base class implementation and are hence more
prone to disruption if you make changes to the base class. I.e.,
typically if you add features to your base model, the derived model will
need to be regenerated and recompiled (though we actually have
generation flags that will generate a pattern that avoids this). See
the commentary in https://bugs.eclipse.org/bugs/show_bug.cgi?id=252501
as an example where implementation changes I need/want to make in Ecore
ends up being disruptive to clients.
> Cheers,
> Joel
>
> On 05/02/2009 14:00, in article gmereo$kfv$1@build.eclipse.org, "Ed Merks"
> <Ed.Merks@gmail.com> wrote:
>
>
>> Joel,
>>
>> UML profiles make sense to apply to UML instances, but Ecore doesn't
>> directly have such a concept and I suspect you might even be asking how
>> to make your own model extensible without other people literally
>> extending the classes in your model. You'll see I often tell people not
>> to extend Ecore (and that they often ignore me only to complain later).
>> I tell them that instead they should decorate Ecore with EAnnotations.
>> Often people notice how conveniently EModelElement already supports
>> EAnnotations and are tempted to extend it in their model; please don't.
>> One of the cool things about EAnnotations is that they can contain or
>> reference any other type of object, so they can be used to embed or
>> reference data from other independent models. So this is the Ecore
>> equivalent of a profile and these concepts could be reused in the design
>> of your own model. I.e., define a root class that all your other
>> classes extend (like EModelElement in Ecore), define an annotation class
>> (like Annotation) and use it on your root class. This will effectively
>> make all parts of your model annotatable...
>>
>>
>> Joel Rosi-Schwartz wrote:
>>
>>> Hi,
>>>
>>> As a part of our modelling efforts for ORMF the use or UML Profiles has been
>>> brought up as a possible strategy to enable adopters to extend our core
>>> model. Since the architectural decision to use EMF has already been made, I
>>> started researching how one goes about applying UML Profiles to an ecore
>>> model. So far am not encouraged from my initial Googling, checking the EMF &
>>> the DSL book and searches on the relevant EF newsgroups.
>>>
>>> So I would like to ask this forum for their collective wisdom. Is using UML
>>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>>> appreciate pointers to any relevant resources to better understand how to
>>> marry the two.
>>>
>>> Many thanks,
>>> Joel
>>>
>>>
>>>
>
>
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Joel,<br>
<br>
Comments below.<br>
<br>
Joel Rosi-Schwartz wrote:
<blockquote cite="mid:C5B23287.197B9%25Joel.Rosi-Schwartz@Etish.org"
type="cite">
<pre wrap="">Hi Ed,
Thanks for the clear reply.
On point I would appreciate if you could clarify. You say:
I tell them that instead they should decorate Ecore with EAnnotations.
I you suggesting that ORMF also discourage adopters from extending our Core
model?
</pre>
</blockquote>
In the UML newsgroup they often talk about light weight extension
(profiling/decorating) verses heavy weight extension (subclasses).<br>
<br>
It's fine to allow people to subclass, but such subclasses are more
intimately tied to the core base class implementation and are hence
more prone to disruption if you make changes to the base class. I.e.,
typically if you add features to your base model, the derived model
will need to be regenerated and recompiled (though we actually have
generation flags that will generate a pattern that avoids this). See
the commentary in <a
href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=252501">https://bugs.eclipse.org/bugs/show_bug.cgi?id=252501</a>
as an example where implementation changes I need/want to make in Ecore
ends up being disruptive to clients.<br>
<blockquote cite="mid:C5B23287.197B9%25Joel.Rosi-Schwartz@Etish.org"
type="cite">
<pre wrap="">
Cheers,
Joel
On 05/02/2009 14:00, in article <a class="moz-txt-link-abbreviated" href="mailto:gmereo$kfv$1@build.eclipse.org">gmereo$kfv$1@build.eclipse.org</a>, "Ed Merks"
<a class="moz-txt-link-rfc2396E" href="mailto:Ed.Merks@gmail.com"><Ed.Merks@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Joel,
UML profiles make sense to apply to UML instances, but Ecore doesn't
directly have such a concept and I suspect you might even be asking how
to make your own model extensible without other people literally
extending the classes in your model. You'll see I often tell people not
to extend Ecore (and that they often ignore me only to complain later).
I tell them that instead they should decorate Ecore with EAnnotations.
Often people notice how conveniently EModelElement already supports
EAnnotations and are tempted to extend it in their model; please don't.
One of the cool things about EAnnotations is that they can contain or
reference any other type of object, so they can be used to embed or
reference data from other independent models. So this is the Ecore
equivalent of a profile and these concepts could be reused in the design
of your own model. I.e., define a root class that all your other
classes extend (like EModelElement in Ecore), define an annotation class
(like Annotation) and use it on your root class. This will effectively
make all parts of your model annotatable...
Joel Rosi-Schwartz wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi,
As a part of our modelling efforts for ORMF the use or UML Profiles has been
brought up as a possible strategy to enable adopters to extend our core
model. Since the architectural decision to use EMF has already been made, I
started researching how one goes about applying UML Profiles to an ecore
model. So far am not encouraged from my initial Googling, checking the EMF &
the DSL book and searches on the relevant EF newsgroups.
So I would like to ask this forum for their collective wisdom. Is using UML
Profiles with EMF a good or bad idea. If it is a good idea, I would
appreciate pointers to any relevant resources to better understand how to
marry the two.
Many thanks,
Joel
</pre>
</blockquote>
</blockquote>
<pre wrap=""><!---->
</pre>
</blockquote>
</body>
</html>
--------------060702090701090601010701--
Ed Merks
Professional Support: https://www.macromodeling.com/
|
|
|
| Re: Using UML Profiles with EMF [message #427233 is a reply to message #427228] |
Fri, 06 February 2009 22:07 |
Hossam Karim
Messages: 26
Registered: July 2009 |
Junior Member |
|
|
Yes, we had to write a full UML2Ecore transformation frist, next steps
were simply extensions and minor modifications to the base transformation
and domain model. We are using QVTo for this.
On Fri, 06 Feb 2009 20:34:48 +0200, Joel Rosi-Schwartz
<Joel.Rosi-Schwartz@etish.org> wrote:
> Hi Hossam,
>
> Thanks for sharing your experience and for the helpful diagram. Have you
> actually achieved all or part the of transformations that you indicate? I
> would be keen to follow your progress with this.
>
> All the best,
> Joel
>
>
> On 05/02/2009 22:17, in article op.uowf6zvihvsg55@hkarim, "Hossam Karim"
> <hossam.karim@gmail.com> wrote:
>
>> Hi Joel,
>> We are facing this typical scenario in one of our projects. We
>> started
>> by not listening to Ed?s advice and extended the Ecore metamodel. Now
>> that we realized we were wrong, we are investigating a different
>> approach.
>> A profile is an extension mechanism, and Ecore metamodel is basically
>> architected to be instantiated by creating your own models. So, if you
>> are
>> able to create an Ecore model that describes precisely your domain
>> model,
>> what maps a profile is an extension to your Ecore model. Please have a
>> look at the attached diagram.
>>
>>
>> Hossam Karim
>>
>>
>> On Thu, 05 Feb 2009 15:20:43 +0200, Joel Rosi-Schwartz
>> <Joel.Rosi-Schwartz@etish.org> wrote:
>>
>>> Hi,
>>>
>>> As a part of our modelling efforts for ORMF the use or UML Profiles has
>>> been
>>> brought up as a possible strategy to enable adopters to extend our core
>>> model. Since the architectural decision to use EMF has already been
>>> made, I
>>> started researching how one goes about applying UML Profiles to an
>>> ecore
>>> model. So far am not encouraged from my initial Googling, checking the
>>> EMF &
>>> the DSL book and searches on the relevant EF newsgroups.
>>>
>>> So I would like to ask this forum for their collective wisdom. Is using
>>> UML
>>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>>> appreciate pointers to any relevant resources to better understand how
>>> to
>>> marry the two.
>>>
>>> Many thanks,
>>> Joel
>>>
>>
>
|
|
|
| Re: Using UML Profiles with EMF [message #427266 is a reply to message #427226] |
Mon, 09 February 2009 16:37 |
| Eclipse User |
|
|
|
Originally posted by: cdamus.zeligsoft.com
Hi, Joel,
UML2 is an extension of EMF so, in that sense, UML Profiles work with
EMF. They are definitely an EMF-based implementation of the MOF Profile
concept, in any case.
Profiles do provide two significant benefits of modeling over
EAnnotations. One is that they are not referenced by the element that
they extend, so that the element is independent of its stereotypes.
Despite this, the UML2 API makes it easy to access the stereotypes in
the context of the base element. Of course, you can just use Ecore to
describe "stereotypes" that reference the extended element, but the
integration providing the reverse-lookup would have to be a custom
implementation.
The other benefit of stereotypes is that they fit nicely into OCL.
Because UML has associations, OCL can navigate from the base element to
its stereotypes very easily. This is not so easy with Ecore, so your
OCL constraints would have to use inverse-referencing operations that
you model explicitly in your Ecore model.
These on their own may not constitute compelling reasons to chosse UML
and Profiles over Ecore for your metamodelling. I guess it depends on
what integration you need with other technologies. In any case, UML2
does produce an Ecore representation of your metamodel anyway, so you
don't lose any options by taking that route.
HTH,
Christian
Joel Rosi-Schwartz wrote:
> Hi Christian,
>
> I am not clear from you post if you are suggesting a way to use Profiles in
> conjunction with EMF or if you are simply arguing that Profiles have
> features that are difficult to achieve with EMF. Would you care to clarify?
>
> Many thanks,
> Joel
>
> On 05/02/2009 14:00, in article gmerdl$kdj$1@build.eclipse.org, "Christian
> W. Damus" <cdamus@zeligsoft.com> wrote:
>
>> Hi, Joel,
>>
>> (including the UML2 newsgroup for their perspective)
>>
>> The MDT UML2 component has been quite successful with their
>> implementation of Profiles for UML. Also, it's possibly a little-known
>> fact, but the Profile mechanism is applicable to any UML-based
>> metamodel, not just the UML, itself. The UML2 run-time library supports
>> this in any generated metamodel.
>>
>> So, because Ecore can be described using UML (see the
>> Ecore.metamodel.uml resource in UML2), one can, in theory, generate
>> Ecore with profile support. :-D Of course, it's probably best to leave
>> Ecore to describe itself.
>>
>> In my own experience, the stereotype mechanism of Profiles offers a very
>> convenient extension facility which readily supports:
>>
>> - optionality: the base model element has no reference to the
>> stereotypes, so stereotypes don't even have to be loaded if
>> the application doesn't need them
>> - traceability: UML2 offers the implicit CacheAdapter instance that
>> facilitates the retrieval of stereotypes applied to an object
>> - transparency: languages such as OCL have built-in support for
>> stereotypes because they behave in every respect like additional
>> metaclasses
>> - type safety: stereotypes are more explicitly structured than
>> EAnnotations, and with UML2's static profile definition, can even
>> have behaviour of their own
>>
>> It's basically a clean implementation of the classic Adapter/Decorator
>> pattern, for models. Profiles in themselves are a good reason to use
>> UML2 and its code generation for your metamodels. Just define your
>> metamodel with support for stereotype extension, and any client
>> application can define domain-specific extensions to your metamodel
>> without the encumbrance of the tight coupling implied by metaclass
>> specialization.
>>
>> HTH,
>>
>> Christian
>>
>>
>> Joel Rosi-Schwartz wrote:
>>> Hi,
>>>
>>> As a part of our modelling efforts for ORMF the use or UML Profiles has been
>>> brought up as a possible strategy to enable adopters to extend our core
>>> model. Since the architectural decision to use EMF has already been made, I
>>> started researching how one goes about applying UML Profiles to an ecore
>>> model. So far am not encouraged from my initial Googling, checking the EMF &
>>> the DSL book and searches on the relevant EF newsgroups.
>>>
>>> So I would like to ask this forum for their collective wisdom. Is using UML
>>> Profiles with EMF a good or bad idea. If it is a good idea, I would
>>> appreciate pointers to any relevant resources to better understand how to
>>> marry the two.
>>>
>>> Many thanks,
>>> Joel
>>>
>
|
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