[Qt-interest] How do you find all the attributes XML?

[Dan White]

If the attributes are variable, you would need to use the  
"attributes" method of QDomElement
This returns a QDomNamedNodeMap which, in this case, is a dynamic  
container of all the element's attributes.
It has a length/size method to tell you how many you have and then  
you can just iterate thru them, accessing the name and value

On Mar 12, 2009, at 4:58 PM, Andrea Franceschini wrote:

> 2009/3/12 Knapp <magick.crow at gmail.com>:
>
>> Can see no way to take an unknown element and find out its  
>> attributes.
>> What did I miss?
>
> Though this is not at all the way to ask something with the intent of
> getting help, I'll try to help anyway. I can only assume you're using
> the DOM.
>
> Suppose you have a piece of XML like this
>
> <root>
>    <tag>
>       <othertag attribute="value" otherattribute="value"/>
>       <othertag attribute="value" otherattribute="value"/>
>    </tag>
> </root>
>
> In the first place, what I'd do is to obtain the root, obviously after
> having opened and parsed the document, that is to say that you already
> have a QDomDocument.
>
> QDomDocument doc;
> /* ... open, parse ...*/
> // Warning, I'm not sure this would be appreciated by purists...
> QDomNodeList otherTags = doc.elementsByTagName("othertag");
> int i;
> // I think that foreach can be used but I'm too lazy to check right
> // now and I always had a reason for doing this way.
> for(i = 0; i < otherTags.size(); i++) {
>    QDomElement otherTag = otherTags.at(i).toElement();
>    // Now you could just use otherTags.at(i).attributes() to have a
>    // QDomNamedNodeMap of attributes but I'd suggest this other
>    // way because QDomElement has
>    // attribute(const QString& name) that lets you refer to a  
> particular
>    // attribute given its name.
>    qDebug() << otherTag.attribute("attribute") <<
> otherTag.attribute("otherattribute");
> }
>
> Sweet, uhu? Once you have a QDomElement you can always reiterate with
> elementsByTagName.
>
> Now a question for the trolls: I know that
> QDomDocument::elementsById(const QString&) is not implemented because
> what the id attribute is unknown in XML but what part of the docs
> didn't I read regarding DTD evaluation? If I'm not wrong, it is
> possible to specify an attribute as unique id for a document, right?
> So what?
>
> -- 
> Andrea
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