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

[Andrea Franceschini]

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