Re: [xml-dev] Web site that emits a continuous stream of XML?

[Dimitre Novatchev <dnovatchev@gmail.com>]

On Wed, May 21, 2014 at 2:30 AM, Costello, Roger L. <costello@mitre.org> wrote:
> Hi Folks,

Hi Roger

>
> I am seeking a web site that has this behavior:
>
> 1. I connect to the web site (I enter its URL) and the web site responds by sending the start tag of the root element.
>
> 2. A short time later (perhaps a few milliseconds) the web site sends the first child element.
>

The definition of "short" isn't precise. If the server sends
uninvited, there is no guarantee that the sent data would be processed
on time.

> 3. A short time later the web site sends the second child element.
>
> 4. The web site continues to send elements, in a continuous, streaming fashion.
>
> 5. When I disconnect from the web site, it responds by sending the end tag of the root element.

Another issue is that if this server has many (thousands) clients and
sends individual stream to each of them, it could easily be overloaded
in sending multitude of "offsets" of the same stream. Also, if the
stream is produced in real time and is sufficiently long, then it
might be impossible for the server to hold all the produced stream
data.

I believe that another scenario would be more practical and realistic:
A server sends a single stream and any connecting client starts
receiving the stream from the point of establishing the connection.

The only problematic moment here is for the client to recognize the
start of some meaningful type (element) and to flush the initial
starting sequence.
Of course, for this to be possible, the type of the types whose
instances are being transmitted need to have some useful properties --
for example that no type should be the starting part (prefix) of
another type -- similar to something I remember from Coding Theory.

There are variations of this requirement -- for example: The client
shouldn't need more than X KB of RAM in order to uniquely identify the
start of the next type-instance represented in the serialized stream.

Hope this is understandable and makes sense.

Cheers,
Dimitre

On Wed, May 21, 2014 at 2:30 AM, Costello, Roger L. <costello@mitre.org> wrote:
> Hi Folks,
>
> I am seeking a web site that has this behavior:
>
> 1. I connect to the web site (I enter its URL) and the web site responds by sending the start tag of the root element.
>
> 2. A short time later (perhaps a few milliseconds) the web site sends the first child element.
>
> 3. A short time later the web site sends the second child element.
>
> 4. The web site continues to send elements, in a continuous, streaming fashion.
>
> 5. When I disconnect from the web site, it responds by sending the end tag of the root element.
>
> Do you know of any such web site?
>
> /Roger
>
> _______________________________________________________________________
>
> XML-DEV is a publicly archived, unmoderated list hosted by OASIS
> to support XML implementation and development. To minimize
> spam in the archives, you must subscribe before posting.
>
> [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/
> Or unsubscribe: xml-dev-unsubscribe@lists.xml.org
> subscribe: xml-dev-subscribe@lists.xml.org
> List archive: http://lists.xml.org/archives/xml-dev/
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php



-- 
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
To achieve the impossible dream, try going to sleep.
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
Typing monkeys will write all Shakespeare's works in 200yrs.Will they
write all patents, too? :)
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.