Namespace support

[dirvens]

Hi, I'm refactoring some code that used the original dart-xml from John Evans to this library. I've come across the namespace limitation - something that for the most part the original library supported. It would at least have the namespaces in scope traverse with the elements, and you could look up the uri based on the prefix. Do you have on your roadmap support for namespaces? If so, when do you anticipate having that in?

Thanks,

-D

[renggli]

Personally I've never used XML namespaces, that's why it is missing. I don't think it would be difficult to add some basic look-up of the URI to the qualified names. I'll have a look.

[renggli]

Would adding a slightly better integrated method in the core-library like the following one help?

/**
 * Find the namespace URI of a given `name` in a `node`.
 */
String getNamespaceURI(XmlName name, XmlNode node) {
  while (node != null) {
    for (var attribute in node.attributes) {
      if ((attribute.name.local == 'xmlns' && attribute.name.prefix == null && name.prefix == null)
          || (attribute.name.prefix == 'xmlns' && attribute.name.local == name.prefix)) {
        return attribute.value;
      }
    }
    node = node.parent;
  }
  return null;
}

[renggli]

Added XmlName#namespaceURI as of 91f4ebe.