[Solved] xml getElementByID how does it work?

[nickGiard]

Xml module is very interesting, if i want write something like tree, like a manual with topics, it is the solution.
Take a simple file xml with ID :

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>
<Root ID="0">
	<Elem ID="A" Txt="Capitolo A"></Elem>
	<Elem ID="B" Txt="Capitolo B"></Elem>
</Root>

I load a DOM

Code: Select all

Dim oDocB : oDocB = CreateUnoService("com.sun.star.xml.dom.DocumentBuilder")
Dim xDoc : xDoc = oDocB.parseURI(sXmlPath) ' percorso del file xml

Now I'd like to get the element whit ID="B" and see that interface xDocument has getElementById(string elementId) method, so :

Code: Select all

Dim MyElem : MyElem  = xDoc.getElementById("B")

This does not work, any idea ???
Thanks in advance

[JeJe]

https://wiki.openoffice.org/wiki/XML_and_Filter

[nickGiard]

Thank you JeJe
I have seen the link, but it is much difficult for me.
I hope an easy answer for an easy question, or not? But nobody seems to give

[JeJe]

There's hardly anything to the Basic code as most of it is (necessary) empty subs and comments, and you don't need to understand it to run it - except where you change the URL to your file location.

Edit: whether that will read your file or not, I don't know, but I've seen it work with other xml files.

[Bidouille]

This does not work, any idea ???

Did you try a search in this forum?
viewtopic.php?t=110832&hilit=documentbuilder

[ms777]

Hi,

replace your xml by:

Code: Select all

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Root [ 
   <!ATTLIST Elem id ID #IMPLIED > 
   <!ATTLIST Root id ID #IMPLIED > 
]>
<Root id="0">
	<Elem id="A" Txt="Capitolo A"></Elem>
	<Elem id="B" Txt="Capitolo B"></Elem>
</Root>

You need to include the ATTLIST lines for each TagName which is supposed to have an id.

[nickGiard]

thank you very much ms777
you open my eyes on DTD, I never used it !!!
It work fine, I have debug it and it is Ok ....
... but when in basic debug window examine xDoc.FirstChild LibreOffice goes to crash :
https://crashreport.libreoffice.org/sta ... 5fb511226e

All is Ok if examine xDoc.DocumentElement.FirstChild and so on.
In Notepad++ show : DTD is not allowed, and in Plugin XMLTools Options Property, I read Prohibit DTD for security.
Do you noticed this?

In the past I resolved my issue creating a dictionary EnumerableMap and while parsing xElements put(id, xElement)
By

[ms777]

Hi,

I can reproduce your observations ...
Probably this is related to https://stackoverflow.com/questions/138 ... -exception. Please keep in mind that the LibreOffice code is probably 30 years old.
Depending on the complexity of your target I would recommend to stay in Basic and do not use DTD / getElementById or to switch to python and use xml.etree.ElementTree, which has basic XPath support

Or you restrict your access to DocumentElement. This seems to work fine ...

Good luck,

ms777

[nickGiard]

Thank you very much ms777
your help and advises are been very useful.
Good coding
NickGiard