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Hi all,

I parse a XML file to get a DOM Document.

But when I use the method Document.getElementsByID(String Id) each time I
receive null.

My XML follow a DTD. But I don't know where to tell to my parser to use this
DTD.

How can I tell it ? and does it change anything to the result of the above
method ?

thx in advance, Jean-Philippe

Jean-Philippe Martin wrote:

> I parse a XML file to get a DOM Document.
>
> But when I use the method Document.getElementsByID(String Id) each time I
> receive null.

There is no method getElementsByID in the W3C DOM. There is method
document.getElementById

> My XML follow a DTD. But I don't know where to tell to my parser to use this
> DTD.
>
> How can I tell it ? and does it change anything to the result of the above
> method ?

Which parser are you using? How do you use the parser, with a
programming language, for instance Java?

--

Martin Honnen
http://JavaScript.FAQTs.com/

>>Jean-Philippe Martin wrote:
>>
>>> I parse a XML file to get a DOM Document.
>>>
>>> But when I use the method >>Document.getElementsByID(String Id) each
time I
>>> receive null.
>>>
>>There is no method getElementsByID in the W3C DOM. There >>is method
>> document.getElementById

you're right. )

>>>
>>> My XML follow a DTD. But I don't know where to tell to >>my parser
to use this
>>> DTD.
>>>
>>> How can I tell it ? and does it change anything to the >>result of
the above
>>> method ?
>>
>>Which parser are you using? How do you use the parser, >>with a
>>programming language, for instance Java?

I've use the tutorial example available on java.sun.com

Here a the begining of the source code to open and parse the file with
Java.

****************************************
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

try{
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File(FileName));
} catch(....)

****************************************

After that point I'm able to use the "doc" variable.

Thanks in advance.


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Jean-Philippe Martin wrote:

[Document.getElementsByID(String Id)]

> ****************************************
> DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
>
> try{
> DocumentBuilder builder = factory.newDocumentBuilder();
> Document doc = builder.parse(new File(FileName));
> } catch(....)
>
> ****************************************
>
> After that point I'm able to use the "doc" variable.

I think, you have to enable validation to successfully use getElementByID().
--
Johannes Koch
In te domine speravi; non confundar in aeternum.
(Te Deum, 4th cent.)

Jean-Philippe Martin wrote:


>>>Which parser are you using? How do you use the parser, >>with a
>>>programming language, for instance Java?
>
>
> I've use the tutorial example available on java.sun.com
>
> Here a the begining of the source code to open and parse the file with
> Java.
>
> ****************************************
> DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
>
> try{
> DocumentBuilder builder = factory.newDocumentBuilder();
> Document doc = builder.parse(new File(FileName));
> } catch(....)
>
> ****************************************
>
> After that point I'm able to use the "doc" variable.

With the following example Java program

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Test20040302 {
public static void main (String[] args) {
try {
DocumentBuilderFactory docBuilderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document xmlDocument = docBuilder.parse(args[0]);
if (xmlDocument != null) {
Element god = xmlDocument.getElementById("Kibo");
if (god != null) {
System.out.println(god.getAttribute("home"));
}
else {
System.out.println("Element not found.");
}
}
}
catch (Exception e) {
System.out.println(e);
}
}
}

when I pass in the filename of the following XML on the command line


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE gods [
<!ELEMENT gods (god)+>
<!ELEMENT god EMPTY>
<!ATTLIST god
name ID #REQUIRED
home CDATA #IMPLIED>
]>
<gods>
<god name="Kibo" home="http://www.kibo.com/" />
<god name="Xibo" />
</gods>

then getElementById("Kibo") finds the right element.
--

Martin Honnen
http://JavaScript.FAQTs.com/

Thx I will try it at home.

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Your example works fine, but have you tried to add an element with a
method ?

for example this method:

static void addNode(Document doc) {
Element elem = doc.createElement("god");
elem.setAttribute("home", "AvProc");
elem.setAttribute("name", "Butch");
((Element)
doc.getElementsByTagName("gods").item(0)).appendCh ild(elem);

}

if you use it in your example, by instance after the search of "kibo"'s
home, you won't be able to find "Butch"'s home with a
getElementById("Butch").

In my application, I construct the xml file dynamically with this kind
of method.

Thx, I hope you see the problem.

Best regards Jean-Philippe.

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Here is a copy/paste of the Java api about this methods:

getElementById
public Element getElementById(java.lang.String elementId)
Returns the Element whose ID is given by elementId. If no such element
exists, returns null. Behavior is not defined if more than one element has
this ID.
Note: The DOM implementation must have information that says which
attributes are of type ID. Attributes with the name "ID" are not of type ID
unless so defined. Implementations that do not know whether attributes are
of type ID or not are expected to return null.

Parameters:
elementId - The unique id value for an element.
Returns:
The matching element.
Since:
DOM Level 2

How can I inform the DOM implementation ???

Thx for your help.

Jean-Philippe Martin wrote:

> Your example works fine, but have you tried to add an element with a
> method ?
>
> for example this method:
>
> static void addNode(Document doc) {
> Element elem = doc.createElement("god");
> elem.setAttribute("home", "AvProc");
> elem.setAttribute("name", "Butch");
> ((Element)
> doc.getElementsByTagName("gods").item(0)).appendCh ild(elem);
>
> }
>
> if you use it in your example, by instance after the search of "kibo"'s
> home, you won't be able to find "Butch"'s home with a
> getElementById("Butch").
>
> In my application, I construct the xml file dynamically with this kind
> of method.

That seems odd to me, but I can confirm that problem with Java 1.4.1_02.
I consider that a bug, I think if the implementation reads in the DTD
and getElementById finds elements parsed from a serialized XML document
then it should also find elements created with the DOM.
I googled around to find out if anyone else run into this but I haven't
found anything about that.
There are other Java DOM parsers than the one the Sun JRE comes with,
maybe XercesJ from http://xml.apache.org/ doesn't have the problem.
--

Martin Honnen
http://JavaScript.FAQTs.com/

It's not THE answer but it's an answer )

Thx for your time ! You're one of the few persons who try to help me.

I will try with another parser.I will post the result next time.

Have a nice day.

Jean-Philippe.



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