XML document identification, and also getting the human language for an element
In Mozilla, figuring out if a document is a HTML document is easy. You simply do (aDocument instanceof HTMLDocument).
If you’re handed a vanilla XML document, it’s also easy. (aDocument instanceof XMLDocument).
XUL docs are handled a little differently; you check to see if it’s an instance of XULDocument
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But what about XHTML documents?
Thanks to a bug which I believe jst fixed, Mozilla reports (aDocument instanceof HTMLDocument) as true for XHTML documents (content-type: application/xhtml+xml). This is good. Unfortunately, (aDocument instanceof XMLDocument) returns false for the same expression.
To my knowledge, there are precisely two content-types for which a document will be considered an HTMLDocument object. One is the text/html content type, which Mozilla parses as “tag soup”. The other is application/xhtml+xml, which must go through the XML parser.
Because I never know when someone else might come up with a content-type for HTML, I figure any time we get a content-type of text/html, Mozilla will not treat the document as XML in any way.
So, I wrote a little function called isXMLDocument, and it’s included via the link at the top of the page.
Why does this matter? It matters a LOT. Applications processing XHTML documents, when dealing with features which are XML-specific or HTML-specific, must know what’s allowed and what’s not. For instance, XML namespaces are useless in HTML (text/html), but are important in XHTML (application/xhtml+xml). So an application processing a document must know if it should use DOM Level 1 methods (Element.getAttribute, for example) or DOM Level 2 methods (Element.getAttributeNS).
Tag soup for thought.
(There’s a bug I just realized in the filter for getLanguage; the filter will accept