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RootElement is null

 
Barry Andrews
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Hi All,
I am just learning about XML, and I have a strange problem with an exercise in my book. I am trying to load an XML document with JavaScript, but after it is loaded, browser complains that RootElement is null. The filename is definitely correct and the XML file is "well-formed." I can load other XML files from other exercises using the same JavaScript just fine (just changing the filename in the load() method). Could someone please take a look at the code below, and see if they can find a problem. I am stumped! Thanks a lot!!!
The XML:

The HTML and JavaScript:


[This message has been edited by Barry Andrews (edited January 01, 2002).]
 
YanNaing WTint
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Barry,
There is a problem with specifying xml namespace,<i>dt</i> in your xml file at the root element, Book. Change <b>urn</b> to <b>uri</b>.
xmlns:dt="uri:schemas-microsoft-com:datatypes"
Hope it will work.

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Yan Naing Wynn Tint (SCJP2, SCWCD)

Yan Naing Wynn Tint (SCJP2, SCWCD)

 
YanNaing WTint
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Barry,
my previous solution is not a correct and proper way.
"urn:schemas-microsoft-com:datatypes" is the correct usage for Unified Resource Name.
The namespace you are using is microsoft datatype schema defination. And the field for that schema is "type". So you must use "dt:type" instead of "dt:dt".
you can check more info at..
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk/htm/xml_tutorial_3x2r.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wss/wss/_cdo_schema_datatypes.asp

------------------
Yan Naing Wynn Tint (SCJP2, SCWCD)

Yan Naing Wynn Tint (SCJP2, SCWCD)

 
Barry Andrews
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YanNaing,
Thanks for your reply! But, if I load another XML file that uses "dt:dt" it works fine, which makes me think there is some other problem. Nevertheless, I will try your suggestion to see if it makes a difference.
Thanks,
Barry
 
Barry Andrews
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YanNaing,
Now I am a little confused. I changed the "dt t" to "dt:type" in my XML code, and it worked just like you said it would. But, I have many other examples (all from the book) that I have been using successfully with "dt t". Do you or anyone else have any ideas as to why this is?
Thanks,
Barry
 
YanNaing WTint
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Barry,
That is an interesting story. Would you give me one of the other working example using dt t. Let me take a look at it. BTW, what brower and version are you using?
Here is the good tutorial, I hope it would help your learning.
web page
 
Barry Andrews
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Here is one that works using "dt:dt". I am using IE6.0. Thanks for the tutorial!
 
YanNaing WTint
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Barry,
Good News.
The problem is at <PublicationDate dt:dt="date">12/20/99</PublicationDate>. In fact, the format of the element content,"12/20/99". The schema that allow the date data type is "CCYY-MM-DD". I think this is MS Xml schema specification. The correct one is like <PublicationDate dt:dt="date">1999-12-20</PublicationDate>.
good luck,

Yan Naing Wynn Tint (SCJP2, SCWCD)

 
Barry Andrews
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Ohhhhhhhhhhhhhhhhhh!!! I see! Yes, that is the problem! I am using BEA XML Editor. It has a parsing feature, but I guess it doesn't actually validate the datatypes. I guess that is asking to much... Thank you very much for your help!

Barry
 
YanNaing WTint
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You are very welcome....
 
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