[MOBY-dev] Binary data streaming

[Dmitry Repchevsky]

Hello Sergio,

> but the atachment is a reference that you have to handle in the same 
> way as if it were in the XML schema, you only change the location. Is 
> this correct? 
XOP/MTOM doesn't affect the XML Schema. It uses XOP:Include to reference 
the binary data.
Unfortunately, XOP specification doesn't reuse XInclude so the only 
reference you can have is to the mime attachment into the same multimime 
message...

Dmitry

Sergio Ramirez Ramirez wrote:
> but the atachment is a reference that you have to handle in the same 
> way as if it were in the XML schema, you only change the location. Is 
> this correct?
>
> Dmitry Repchevsky wrote:
>> Hello, Sergio,
>>
>>> What is the advantage of have a reference to a binary data in the 
>>> atachments? Couldn't we got the same behaviour by adding the 
>>> reference in the current moby XML structure? 
>> Yes we could... The difference is that in the case of attachment, 
>> logically your data are in the same XML document.
>> In case of using some external reference they couldn't be parsed 
>> using standard XML library and have to be parsed by "moby" framework.
>> The same amount of work is needed by the service developer. If I use 
>> a standard way - I just construct my message and send it. The 
>> resource itself is a part of XML infoset.
>> Then I put some structure into an XML that have some external 
>> meaning, I have to publish my resource somehow (for example through 
>> the servlet).
>> The latter means that we are moving farther away from web services 
>> and SOAP.
>>
>> The main idea of web services is that we don't need any additional 
>> framework for the interoperability...
>> At this moment this is not the case and maybe should never be an 
>> objective, but IMHO I'd like at least to move in this direction...
>>
>> Best regards,
>> Dmitry
>>
>> Sergio Ramirez Ramirez wrote:
>>> Hello Dmitry and others.
>>>
>>> Just a small question.
>>>
>>> What is the advantage of have a reference to a binary data in the 
>>> atachments? Couldn't we got the same behaviour by adding the 
>>> reference in the current moby XML structure?
>>>
>>> Could you explain me please?
>>>
>>> Best regards
>>> Sergio
>>>
>>> Dmitry Repchevsky wrote:
>>>> Hello Martin,
>>>>
>>>>> What do you mean by "implement streaming"? I concluded that you meant
>>>>> "sending binary data from (or to) a moby service". Is is correct?
>>>>>   
>>>> yes it is.
>>>>> This is again a SOAP-based specification, meaning another way how 
>>>>> to make an
>>>>> attachment (correct?).
>>>>>   
>>>> XOP is the XML way to reference a binary attachment for XML using a 
>>>> reference to it.
>>>> Even in theory it is not SOAP dependent, the only implementation I 
>>>> know (I may be wrong) is a MTOM that is for SOAP protocol.
>>>> I couldn't find an implementation for straight XML (because we need 
>>>> a transport for it).
>>>>
>>>>> If the protocol for dereferencing is HTTP, we can use MIME type 
>>>>> (content-type HTTP header) for
>>>>> references data.
>>>>>   
>>>> This is what XOP is about - the only problem is that it can not 
>>>> reference an external resource.
>>>>
>>>> It would be great to have something based on Servlet + XML + XOP on 
>>>> java, but I looked at  JAX-RS (JSR-311) REST and there is nothing...
>>>>
>>>> I had an idea, but afraid it has a problem with an implementation.
>>>>
>>>> The idea is to use XML attachment (instead of binary one) and in 
>>>> those attachment put XInclude with a link to external document.
>>>> Such document itself would be an XML with a binary attachment.
>>>>
>>>> So we would have:
>>>>
>>>> External resource represented by XML (moby ontology class like 
>>>> MobyImage) + a binary attachment with an image data itself.
>>>> Then we have a main document with a MobyRef primitive that is 
>>>> encoded as an XML attachment where an attachment itself is an 
>>>> XInclude to the MobyImage.
>>>> This way the document is assembled into a standard moby message 
>>>> automagically:
>>>>
>>>> The only problem is that XInclude works with a plain XML, I think...
>>>>
>>>> Cheers,
>>>>
>>>> Dmitry
>>>> _______________________________________________
>>>> MOBY-dev mailing list
>>>> MOBY-dev at lists.open-bio.org
>>>> http://lists.open-bio.org/mailman/listinfo/moby-dev
>>>>
>>>
>>
>