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DOM semantics for absent prefix on setAttributeNS qualifiedName
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DOM semantics for absent prefix on setAttributeNS qualifiedName
by Bugzilla from ak.miller@auckland.ac.nz
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Hi,
The current Gdome returns an exception when you call setAttributeNS with a namespace but a qualifiedName without a prefix. This is incorrect according to my reading of the DOM specification... The code: } else if (!strs[1] && namespaceURI != NULL) { /* there's no ':' */ prefix = g_strdup(""); localName = g_strdup(strs[0]); if (strcmp (localName, "xmlns")) *exc = GDOME_NAMESPACE_ERR; The text of the DOM Level 2 specification: ------------------------------------------------------------------------------ setAttributeNS introduced in DOM Level 2 Adds a new attribute. If an attribute with the same local name and namespace URI is already present on the element, its prefix is changed to be the prefix part of the qualifiedName, and its value is changed to be the value parameter. This value is a simple string; it is not parsed as it is being set. So any markup (such as syntax to be recognized as an entity reference) is treated as literal text, and needs to be appropriately escaped by the implementation when it is written out. In order to assign an attribute value that contains entity references, the user must create an Attr node plus any Text and EntityReference nodes, build the appropriate subtree, and use setAttributeNodeNS or setAttributeNode to assign it as the value of an attribute. HTML-only DOM implementations do not need to implement this method. Parameters namespaceURI of type DOMString The namespace URI of the attribute to create or alter. qualifiedName of type DOMString The qualified name of the attribute to create or alter. value of type DOMString The value to set in string form. Exceptions DOMException INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character. NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly. NAMESPACE_ERR: Raised if the qualifiedName is malformed, if the qualifiedName has a prefix and the namespaceURI is null, if the qualifiedName has a prefix that is "xml" and the namespaceURI is different from "http://www.w3.org/XML/1998/namespace", or if the qualifiedName is "xmlns" and the namespaceURI is different from "http://www.w3.org/2000/xmlns/". No Return Value --------------------------------------------------------------------------- The definition of a qualified name: --------------------------------------------------------------------------- qualified name A qualified name is the name of an element or attribute defined as the concatenation of a local name (as defined in this specification), optionally preceded by a namespace prefix and colon character. See Qualified Names in Namespaces in XML [Namespaces]. ----------------------------------------------------------------------------- If gdome is to conform to a specification, it can only raise a NAMESPACE_ERR if one of the reasons listed applies. namespaceURI is not NULL, and qualifiedName does not start with xml. Therefore, the only remaining justification for raising NAMESPACE_ERR is that the qualifiedName is malformed. But the prefix is optional, so this doesn't apply either. It should be sufficient just to remove the check(of course, not all serialisers will work correctly if you serialise the output with a null prefix but a non-null namespace, but I believe that becomes a bug in the serialiser and not the DOM implementation). Best regards, Andrew Miller ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. _______________________________________________ gdome mailing list gdome@... http://mail.gnome.org/mailman/listinfo/gdome |
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