Project

Profile

Help

Forums » Help »

Does XdmNode.NodeName expose whether a CDATA section is wrapped?

Added by Martin Honnen about 3 years ago

While using SaxonCS on an input wrapped around an XmlDocument I find that the XdmNode representing a text node in the XDM tree has NodeName property indicating with a QName of Q{}#cdata-section that as CDATA section node in the DOM has been wrapped.

Is that something to rely on to identify a CDATA section using an extension function?

I first tried to look at xdmNode.getUnderlyingXmlNode().NodeType to see whether a CDATA section is wrapped.


Replies (6)

Please register to reply

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Michael Kay about 3 years ago

This is certainly a bug, since Q{}#cdata-section is not even a valid QName.

Also (and I would need to check if this is actually implemented), XDM does not allow adjacent text nodes, so adjacent text/cdata nodes in the DOM should be wrapped by a single text node in XDM.

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Martin Honnen about 3 years ago

That (e.g. Q{}#cdata-section) is the EQName property value in the debugger of the Saxon.Api.QName value is see. For a plain text node it is "Q{}#text".

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Martin Honnen about 3 years ago

Full property list in debugger looks like

-		NodeName	{#cdata-section}	Saxon.Api.QName
		ClarkName	"#cdata-section"	string
		EQName	"Q{}#cdata-section"	string
		LocalName	"#cdata-section"	string
		Prefix	""	string
		Uri	""	string

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Martin Honnen about 3 years ago

I get the same output with Saxon HE 10.6 .NET:

-		NodeName	{#cdata-section}	Saxon.Api.QName
		ClarkName	"#cdata-section"	string
		EQName	"Q{}#cdata-section"	string
		LocalName	"#cdata-section"	string
		Prefix	""	string
		Uri	""	string

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Michael Kay about 3 years ago

Not surprising, the SaxonCS code for wrapping the XmlDocument DOM has hardly changed from the code in Saxon/.NET, except for conversion from Java to C#.

RE: Does XdmNode.NodeName expose whether a CDATA section is wrapped? - Added by Martin Honnen about 3 years ago

This naming convention might have some origin in the W3C DOM: https://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-F68D095 says

The values of nodeName, nodeValue, and attributes vary according to the node type as follows:

Interface	nodeName	nodeValue	attributes

CDATASection	"#cdata-section"	same as CharacterData.data, the content of the CDATA Section	null
Comment	"#comment"	same as CharacterData.data, the content of the comment	null
Document	"#document"	null	null
DocumentFragment	"#document-fragment"	null	null
DocumentType	same as DocumentType.name	null	null
Element	same as Element.tagName	null	NamedNodeMap
Entity	entity name	null	null
EntityReference	name of entity referenced	null	null
Notation	notation name	null	null
ProcessingInstruction	same as ProcessingInstruction.target	same as ProcessingInstruction.data	null
Text	"#text"	same as CharacterData.data, the content of the text node	null
    (1-6/6)

    Please register to reply