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Re:10 minutes in XML??? [Re:floater]

irisjacky

CJSDN高级会员

发贴: 70
积分: 70

于 2003-01-07 11:01

The following websites and tutorials are part of the ones I get into XML . I can't remeber all because I have read too much material about this. I just try my best to recall.

1.www.xml.com (run by publishers O'Reilly) is an excellent source of articles on all topics XML.
2. http://www-106.ibm.com/developerworks/xml/library/x-xslt5.html This will be useful when you begin writing XSLT stylesheets
3.James Clark explains XML Namespaces. http://www.jclark.com/xml/xmlns.htm
4. http://www.zvon.org/ is an excellent tutorial website for XML begginner
5. http://www.w3schools.com/ is another terrific resource let begginner to experience web technology including XML
6. Attached please find some slides from a very good australian xml technology company.

From my point of view, I prefer xml schema to DTD. First of all, DTD is not a rich enough language to specify all XML applications. Furthermore,DTD uses a non-XML syntax( needs different tools to process). On the contrary, XML Schema languages is a XML based languages, which does provide all of the capabilities of DTD and more. XML schema also maintain and extend the idea of document validity . However, it doesn't mean DTD is dead. Someone still argue that xml schema is more complex than DTD. You may need to decide which technology to use due to your customer's needs. Actually, the construction of some may component in webservices including UDDI, WSDL, SOAP are using the idea of xml schema.
In adddition, I think it is important to point out some new technology like RELAXNG which provides more powerful xml processing. Here is a interesting article talking about comparison between xml schema and relaxng
http://www.xml.com/pub/a/2002/01/23/relaxng.html

Regard to XSLT, as I suggest in other post, it does provide you a very powerful presentation transformation template, which normally used together with Servlet processing. Here I list some brief advantage of XSLT.
1. XSLT can be used to separate data, program, logic and presentation
2. XML and XSLT can be developed independently of servlet code
3.Modularity of presentation improves maintenance
4.Can target multiple client devices via different stylesheets
The only weakness I can see is that it adds layer of abstraction and extra step, slower runtime performance.
If you want to know more, I do recommend you read the book called <<java and xslt>> which give you a beautiful idea of XSLT processing and how to integrate it with J2EE. I don't know whether FTP contain it or not because I don't have the access to FTP. If not, I can upload one ebook which cost a lot bucks to buy one from O'reilly. Smile

Another interesting thing about xml is that xml technology provide the normal function of database rather than presentation logic only.
XML is self-describing, portable and has rich expressiveness to represent any tree or graph structure.
elementary storage (XML documents)
schemas (DTD.s, XML Schema)
query languages (XQuery, XPath)
programming interfaces (SAX, DOM, JDOM
All of these are DB features, aren't they?
Of course, xml is not a complete DB. it doesn't provide transation management and so on. I don't want to mention anymore in the case that all of you may be expert in DB.

In the beginning ,floater talking about what are the steps to go from db to html? It is really up to how you store the xml data into DB. There are many methodology available now. I just point out one to make you have some taste. You can store xml as string (Character Large Object). Store each top level element as a string field of a tuple in a database. Use a separate relation for each top-level element type. Store values of subelements/attributes as extra indexes
Benefits:
Can store any XML data even without DTD as long as there are many top-level elements in a document, strings are small compared to full document, allowing faster access to individual elements.
Drawback: Need to parse strings to access values inside the elements; parsing is slow.

There you go! I just briefly go through the interesting piont of xml technology I can remeber now. Hope it helps you a bit. I do think XML is a terrific technology and provide us much much much more than most people normally think. That's why SUN, IBM, MICROSOFT.... treat it as a big thing.

Finally, whatever background you have or how intelligent you are, it is totally booshit to learn a technology in 10 minutes or even so called "14 days".

s_Comp_Soc_3hour.pdf (481.75k)

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话题树型展开

人气	标题	作者	字数	发贴时间
18285	10 minutes in XML???	floater	558	2002-12-17 11:03
16890	Re:10 minutes in XML???	wishmaster	462	2002-12-17 15:47
17084	Re:10 minutes in XML???	floater	1956	2002-12-18 00:42
16623	Re:10 minutes in XML???	wishmaster	3044	2002-12-19 15:02
17566	Re:10 minutes in XML???	floater	534	2002-12-20 02:55
16588	Re:10 minutes in XML???	wishmaster	117	2003-01-07 11:53
16865	Re:10 minutes in XML???	jackycct	866	2003-02-14 15:32
16717	Re:10 minutes in XML???	wishmaster	596	2002-12-17 17:11
16639	Re:10 minutes in XML???	wishmaster	0	2002-12-17 17:18
16605	Re:10 minutes in XML???	wishmaster	0	2002-12-17 17:23
16623	O'Reilly - XML In Nutshell 2nd Edition Uploaded	wishmaster	91	2002-12-17 17:26
17207	look here	coder	384	2002-12-18 16:14
17010	Re:look here	floater	628	2002-12-19 00:12
16764	Re:look here	wishmaster	506	2002-12-19 15:10
17077	my option	coder	142	2002-12-19 11:15
17362	Re:my option	floater	592	2002-12-20 02:27
17268	xsql info	coder	634	2002-12-20 10:03
16998	Re:xsql info	wishmaster	918	2002-12-21 16:38
17063	Re:10 minutes in XML???	floater	41	2002-12-21 00:02
16745	Re:10 minutes in XML???	irisjacky	4475	2003-01-07 11:01
17679	Re:10 minutes in XML???	floater	704	2003-01-07 12:39
16662	Re:10 minutes in XML???	wishmaster	615	2003-01-07 13:08
17286	Re:10 minutes in XML???	floater	339	2003-01-08 12:48

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