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| Re: XMI and "vendor independent" paradigm [message #664473 is a reply to message #664469] |
Sat, 09 April 2011 09:48   |
 Ed Willink
Messages: 7655
Registered: July 2009 |
Senior Member |
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Hi Mario
Consider an analogy:
XMI is like ASCII; it at least ensures that there is commonality wrt to
an alternative character coding such as EBCDIC. It does nothing to
ensure useful content.
XMI is used to serialize a model conforming to a meta-model. These can
be CMOF or EMOF (or, as from UML 2.4, UML) or Ecore or ...; continuing
the anlogy these are like Enghlish or French or German; setiously different.
For each meta-model, there is a namespace such as
http://www.omg.org/spec/UML/20100901; continuing the anology these are
dialects such as UK or US or European English - usually pretty similar
but hostorically (UML 1.x) there may be major variation such as Pigeon
English.
If a tool does not recognise either the meta-model or the namespace the
tool cannot understand the input.
For a long time the UML spec did not have an official namespace so tools
were forced to guess inconsistently. More recently each new UML revision
has a new official namespace, so tools must have translators between
namespaces/dialects. Not all tools support all namespaces, so some
exporters use popular de facto namespaces.
Also XMI evolves to gradually eliminate misinterpretations between tools
in particular the encoding of URIs.
Regards
Ed Willink
On 09/04/2011 09:50, mw wrote:
> Hi!
>
> I have some problems with understanding real nature of xmi format.
> I thought, that XMI is a OMG standard for exchanging UML models
> between different tool vendors,and it's platform, and vendor independent.
> Eclipse Modeling Framework based on ecore format (xmi dialect, I
> think). Why it's necessary to convert between different xmi
> format(f.e.ArgoUML,EA) and ecore xmi (via Argo2Ecore or EA Exporter
> for Ecore Models ).
>
> What about xmi "vendor independent" paradigm?
>
> Thanks for explanation
>
> Best regards
> mario
>
>
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| Re: XMI and "vendor independent" paradigm [message #664501 is a reply to message #664473] |
Sun, 10 April 2011 06:01 |
mw 
Messages: 2
Registered: April 2011 |
Junior Member |
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Ed, thank you very much 
| Edward Willink wrote on Sat, 09 April 2011 05:48 | Hi Mario
Consider an analogy:
XMI is like ASCII; it at least ensures that there is commonality wrt to
an alternative character coding such as EBCDIC. It does nothing to
ensure useful content.
XMI is used to serialize a model conforming to a meta-model. These can
be CMOF or EMOF (or, as from UML 2.4, UML) or Ecore or ...; continuing
the anlogy these are like Enghlish or French or German; setiously different.
For each meta-model, there is a namespace such as
http://www.omg.org/spec/UML/20100901; continuing the anology these are
dialects such as UK or US or European English - usually pretty similar
but hostorically (UML 1.x) there may be major variation such as Pigeon
English.
If a tool does not recognise either the meta-model or the namespace the
tool cannot understand the input.
For a long time the UML spec did not have an official namespace so tools
were forced to guess inconsistently. More recently each new UML revision
has a new official namespace, so tools must have translators between
namespaces/dialects. Not all tools support all namespaces, so some
exporters use popular de facto namespaces.
Also XMI evolves to gradually eliminate misinterpretations between tools
in particular the encoding of URIs.
Regards
Ed Willink
On 09/04/2011 09:50, mw wrote:
> Hi!
>
> I have some problems with understanding real nature of xmi format.
> I thought, that XMI is a OMG standard for exchanging UML models
> between different tool vendors,and it's platform, and vendor independent.
> Eclipse Modeling Framework based on ecore format (xmi dialect, I
> think). Why it's necessary to convert between different xmi
> format(f.e.ArgoUML,EA) and ecore xmi (via Argo2Ecore or EA Exporter
> for Ecore Models ).
>
> What about xmi "vendor independent" paradigm?
>
> Thanks for explanation
>
> Best regards
> mario
>
>
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