[Extgraph-developer] RE: XML framework

[Pavel V. <cz3...@ti...>]

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 tog=
ether
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 proj=
ect
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 might=

>need them later. Implementing it now would be far more easy than when th=
ere's
>a jungle of code surrounding it.
>As I am not up-to-date with XML, xsl, xpath and really anything surround=
ing
>XML, I would like to trust you in making the right 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 Syntax-hi=
ghlighter,
>which one are you using for this?
>
>Cheers,
>Stefan
>
>-----Oorspronkelijk bericht-----
>Van: ext...@li... [mailto:extgraph-dev=
elo...@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 curr=
ent
>status a little.
>In current version XML processing is based on my library which I call XO=
bjects.
>Intention of XObjects is to create easy to use XML framework aimed espec=
ially
>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 example=

>is XML element and attribute. Usually these are implemented as different=

>objects,  I use only one for both XML node which has type flag. Advantag=
es
>of this approach is that there is less to explain, programmer can work,
learn
>and understand fewer objects and processing of XML data is more straight=
forward.
> For example you need to store incomming XML data into database. Typical=
ly
>sometimes are data stored in elements and/or attributes. Using usual DOM=

>implementation you must find if requiered are stored in element or attri=
bute
>and then use DOM object accordingly. Using 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 ca=
re
>about typecastings and conersions. You can use for example Node.AsString=
,
>AsNumber, AsBoolean, AsDate ....  Sometimes decimal deilimiter is point,=

>sometimes comma. In datetime types there is jungle.
>Another valuable trick is that during parsing element names are not stor=
ed
>in String value, but it is refernce to sorted StringList. It 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 addressin=
g
>is used instead of  repeated sequence searches.
>
>I compared performace of XObjects and XMLPartner on large xml files (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%. 
>I have also found that TurboPower made DOM extensions very similar to mi=
ne.
>For example they have option to create Attribute and Element string list=
s.
>
>I have discussed advantages of XObjects , now I will make commented list=

>of XML Partner TurboPower solution.
>- XML Partner has broader support of character encoding, especially they=

>suport more UTF versions. It seams that there is not sufficient support
of
>national character sets, which is neither in XObjects, but is in 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 al=
most
>none
>- broader support and probably stability, while XML Partner has been use=
d
>longer and in far more installations.
>
>This leads me to an idea to use extended XML Partner and switch to it fr=
om
>XObjects. Features probably can enhanced so, that we can have the 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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