Consider the following xml fragment:
<Obj> <Name><![CDATA[SomeText]]></Name> </Obj>
How do I retrieve the "SomeText" value via XPath? I'm using Nauman Leghari's (excellent) Visual XPath tool./Obj/Name
returns the element/Obj/Name/text()
returns blank
I don't think its a problem with the tool (I may be wrong) - I also read XPath can't extract CDATA (See last response in this thread) - which sounds kinda weird to me.
XPath Standard Functions Today XPath expressions can also be used in JavaScript, Java, XML Schema, PHP, Python, C and C++, and lots of other languages.
In general, an XPath expression specifies a pattern that selects a set of XML nodes. XSLT templates then use those patterns when applying transformations. (XPointer, on the other hand, adds mechanisms for defining a point or a range so that XPath expressions can be used for addressing).
XPath text() function is a built-in function of the Selenium web driver that locates items based on their text. It aids in the identification of certain text elements as well as the location of those components within a set of text nodes.
/Obj/Name/text()
is the XPath to return the content of the CDATA markup.
What threw me off was the behavior of the Value property. For an XMLNode (DOM world), the XmlNode.Value property of an Element (with CDATA or otherwise) returns Null. The InnerText property would give you the CDATA/Text content. If you use Xml.Linq, XElement.Value returns the CDATA content.
string sXml = @" <object> <name><![CDATA[SomeText]]></name> <name>OtherName</name> </object>"; XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml( sXml ); XmlNamespaceManager nsMgr = new XmlNamespaceManager(xmlDoc.NameTable); Console.WriteLine(@"XPath = /object/name" ); WriteNodesToConsole(xmlDoc.SelectNodes("/object/name", nsMgr)); Console.WriteLine(@"XPath = /object/name/text()" ); WriteNodesToConsole( xmlDoc.SelectNodes("/object/name/text()", nsMgr) ); Console.WriteLine(@"Xml.Linq = obRoot.Elements(""name"")"); XElement obRoot = XElement.Parse( sXml ); WriteNodesToConsole( obRoot.Elements("name") );
Output:
XPath = /object/name NodeType = Element Value = <null> OuterXml = <name><![CDATA[SomeText]]></name> InnerXml = <![CDATA[SomeText]]> InnerText = SomeText NodeType = Element Value = <null> OuterXml = <name>OtherName</name> InnerXml = OtherName InnerText = OtherName XPath = /object/name/text() NodeType = CDATA Value = SomeText OuterXml = <![CDATA[SomeText]]> InnerXml = InnerText = SomeText NodeType = Text Value = OtherName OuterXml = OtherName InnerXml = InnerText = OtherName Xml.Linq = obRoot.Elements("name") Value = SomeText Value = OtherName
Turned out the author of Visual XPath had a TODO for the CDATA type of XmlNodes. A little code snippet and I have CDATA support now.
MainForm.cs
private void Xml2Tree( TreeNode tNode, XmlNode xNode) { ... case XmlNodeType.CDATA: //MessageBox.Show("TODO: XmlNodeType.CDATA"); // Gishu TreeNode cdataNode = new TreeNode("![CDATA[" + xNode.Value + "]]"); cdataNode.ForeColor = Color.Blue; cdataNode.NodeFont = new Font("Tahoma", 12); tNode.Nodes.Add(cdataNode); //Gishu break;
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