RE: [Extgraph-developer] RE: XML framework

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I guess it's a good thing we can mess about with our baby's genetics =
than ;)
Here at work we also use the SynEdit package, I like how it works and =
there's a very active community around it.
But then again, there's nothing wrong with the JEDI project...=20

Cheers,
Stefan

-----Oorspronkelijk bericht-----
Van: ext...@li... =
[mailto:ext...@li...] Namens Pavel =
Vrecion
Verzonden: dinsdag 2 november 2004 13:01
Aan: Ext...@li...
Onderwerp: [Extgraph-developer] RE: XML framework

I hope that mixing will bring the best, but there is famous saying (from =
Oscar Wild I think).
When one woman said to him that she is pretty and he is clever, so we =
together can have pretty and clever children, he replied that opposite =
outcome i.e.
ugly and dull children is also possible.
So I will try my best to have nice and clever child, feature rich, =
simple, fast and well documented and supported XML framework.

Syntax hilighting is based on TJvHLEditor which is part of  JCL/JVCL =
project lead by JEDI  see http://www.delphi-jedi.org.
There is another good option SynEdit, which is on also one of sf =
projects.

>-- P=F9vodn=ED zpr=E1va --
>Subject: RE: [Extgraph-developer] (no subject)
>From: "Stefan Melis" <ste...@po...>
>To: <Ext...@li...>
>Date: Tue, 2 Nov 2004 12:08:41 +0100
>
>
>Pavel,
>
>I think that if you can combine the best of both worlds this must lead
to
>the best solution.
>We might not need all the features XMLPartner offers us now but we=20
>might need them later. Implementing it now would be far more easy than=20
>when there's a jungle of code surrounding it.
>As I am not up-to-date with XML, xsl, xpath and really anything=20
>surrounding XML, I would like to trust you in making the right=20
>decision, as you seem to know a hell of a lot more about it than I.
>
>One other thing, I saw in the (xgraph) demo app that you use a=20
>Syntax-highlighter, which one are you using for this?
>
>Cheers,
>Stefan
>
>-----Oorspronkelijk bericht-----
>Van: ext...@li...=20
>[mailto:ext...@li...]
>Namens Pavel Vrecion
>Verzonden: dinsdag 2 november 2004 11:31
>Aan: Ext...@li...
>Onderwerp: [Extgraph-developer] (no subject)
>
>I took a look at TurboPower XML Partner which is Pascal implementation
of
>XML DOM (Document Object Model) and other XML related technologes like
SAX
>(event based) parser, xpath and xsl processing ....
>Question is is to switch to it.
>I would like to summarize pros and cons, but before I must describe=20
>current status a little.
>In current version XML processing is based on my library which I call =
XObjects.
>Intention of XObjects is to create easy to use XML framework aimed=20
>especially at database and xml processing.
>From implemntation recommendations from w3c.org it differs in following
areas.
>Condtradictory to usual DOM it works with fewer objects. Typical=20
>example is XML element and attribute. Usually these are implemented as=20
>different objects,  I use only one for both XML node which has type=20
>flag. Advantages of this approach is that there is less to explain,=20
>programmer can work,
learn
>and understand fewer objects and processing of XML data is more =
straightforward.
> For example you need to store incomming XML data into database.=20
>Typically sometimes are data stored in elements and/or attributes.=20
>Using usual DOM implementation you must find if requiered are stored in =

>element or attribute and then use DOM object accordingly. Using=20
>XObjects you just do not care while both are the same and you work with =
Node.Name and Node.Value.
>Another added value is data type. XML can be typed and XObjects takes=20
>care about typecastings and conersions. You can use for example=20
>Node.AsString, AsNumber, AsBoolean, AsDate ....  Sometimes decimal=20
>deilimiter is point, sometimes comma. In datetime types there is =
jungle.
>Another valuable trick is that during parsing element names are not=20
>stored in String value, but it is refernce to sorted StringList. It=20
>means that
redundant
>in memory strings are automatically removed, and taska like finding all
element
>with given name is much faster, while binary search and direct=20
>addressing is used instead of  repeated sequence searches.
>
>I compared performace of XObjects and XMLPartner on large xml files=20
>(2MB
>+) and I found expected results. While XObjects parsing time is longer,
>it consumes less memory. In both cases, memory and time is about 30%.=20
>I have also found that TurboPower made DOM extensions very similar to =
mine.
>For example they have option to create Attribute and Element string =
lists.
>
>I have discussed advantages of XObjects , now I will make commented=20
>list of XML Partner TurboPower solution.
>- XML Partner has broader support of character encoding, especially=20
>they suport more UTF versions. It seams that there is not sufficient=20
>support
of
>national character sets, which is neither in XObjects, but is in=20
>OpenXML,  which is yet another pascal XML DOM implementation.
>- SAX like event based parser, in XObjects misiing
>- faster, but more memory consuming, parsing
>- validation against DTD, good error handling
>- XPath implementation, feature that is in XObjects in development
>- buffered streams, this feature enables processing of data larger than
available
>memory, missing in XObjects
>- XSLT processing and transformations to HTML, XML, text and RTF, very
good
>feature that can enhance processing capabalities in the future
>- very good documentation 500+ pages manual and winhelp, XObjects has=20
>almost none
>- broader support and probably stability, while XML Partner has been=20
>used longer and in far more installations.
>
>This leads me to an idea to use extended XML Partner and switch to it=20
>from XObjects. Features probably can enhanced so, that we can have the=20
>best
from
>both worlds. It  would probably also mean to became a developer of XML
Partner
>to ensure, that new added features will be present in future releases.
>
>
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