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DTD Reference from a DOMDocument

Posted on 2001-07-05
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Last Modified: 2013-11-19
Here's one for you MSXML gurus.

I am creating an XML file using the DOMDocument object in VB, building nodes, but I can't figure out how to reference a DTD so that MyXMLDOMDocument.xml gives me back the <!DOCTYPE> node.   Anyone know how to
1.) Reference a DTD from the DOM
2.) Create a node that references the DTD from the DOM

Thanks all!
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Question by:hvest
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12 Comments
 
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Expert Comment

by:Lunchy
ID: 6256601
You posted this question twice.  Just to let you know I deleted the duplicate.

Lunchy
Community Support Moderator
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Expert Comment

by:mattyk
ID: 6256715
Have you taken a look at the doctype property?  So for a sample xml like:

<?xml version="1.0"?>
<!DOCTYPE note SYSTEM "note.dtd">
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>

the following code would give me note:

Dim objXML As New MSXML2.DOMDocument
objXML.Load ("E:\ee.xml")
debug.print(objXML.doctype.basename)
debug.print(objXML.doctype.xml)

-matty


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Author Comment

by:hvest
ID: 6256836
Unfortunately, I don't have an xml file to load...I am actually building the XML on the fly using the XMLDOM and SQL data.  Thus I need to reference the DTD in the DOM so that MyDOMDocument.xml would yield:

<?xml version="1.0"?>
<!DOCTYPE note SYSTEM "note.dtd">
<blah></blah>

I can do everything but the <!Doctype> node.

Basically I either need to set the doctype property of my DOMDocument (but doctype is read-only), or reference an external DTD from inside of my DOMDocument
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Expert Comment

by:mattyk
ID: 6257225
Well I came across this:


which hints that the only way to accomplish this is to take your current xml , convert it to a string, add the <!Doctype> node and then reload the string back into the DOMDocument object.

http://www.vbxml.com/xml/articles/dom_xml_prog/default-19.asp?printerversion=true

-matty
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Expert Comment

by:Dave_Greene
ID: 6257298
Why not, when you first create the DOM create it by adding a string... then you can append the desired nodes

Dim objXML As New MSXML2.DOMDocument

strTemp = "<?xml version='1.0'?><!DOCTYPE note SYSTEM 'note.dtd'>"


objXML.xml = strTemp
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Author Comment

by:hvest
ID: 6257306
I wonder if there is any other way?  I haven't been able to find one yet...
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Author Comment

by:hvest
ID: 6257315
That's a good suggestion Dave, but .xml is a read-only property
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Expert Comment

by:Dave_Greene
ID: 6257329
It's been a couple of months since I've worked with it, just found your question... I'll see what I can come up with...
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Accepted Solution

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Dave_Greene earned 300 total points
ID: 6257465
Ok, here it is...  Another unfortunate limitation of XML & DTDs.  As far as accomplishing what you want in code, you will need to create a text file programmatically with your version / DTD info...

<?xml version="1.0"?>
<!DOCTYPE note SYSTEM "note.dtd">

Then you will need to load this file into your DOM

objDOM.load "C:\Temp\temp.xml"

Then append your nodes as needed.

There is no easy way around this one.

It would be nice if it worked like Matty and I initially thought (Build the string and pop it into the DOM), but no beans.

Hope this helps!

-Dave
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Author Comment

by:hvest
ID: 6257517
Thanks Dave!  Looks like I just got the short end of the stick on this problem...gonna have to go with the work-around
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Expert Comment

by:Dave_Greene
ID: 6257558
Just one last note,

When using an internal DTD you do not need to define SYSTEM OR PUBLIC  ...  or an external file name...

Just

<!DOCTYPE note>

Cheers
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Expert Comment

by:Dave_Greene
ID: 6257563
And of course...

Whatever DTD elements

<!DOCTYPE note[
    <!-- this is where the internal DTD subset is located. -->
  ]>
  <note>

Have a good one!
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