want to get nodes from xml string in c#

Question

1.00/5 (2 votes)

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i want to get the inner xml for the string given bleow

XML

<owl:Thing rdf:about="#CarAdsIns1">
  <hasMake rdf:resource="#MakeIns1"/>
  <hasModel rdf:resource="#ModelIns1"/>
  <hasYear rdf:resource="#YearIns1"/>
  <hasMileage rdf:resource="#MileageIns1"/>
  <hasPrice rdf:resource="#PriceIns1"/>
  <hasPhoneNr rdf:resource="#PhoneNrIns1"/>
</owl:Thing>

code is:

C#

private void button1_Click(object sender, EventArgs e)
{
  string s = textBox1.Text;
  XmlDocument xml = new XmlDocument();
  xml.LoadXml(s); // suppose that myXmlString contains "<names>...</names>"

  XmlNodeList xnList = xml.SelectNodes("/owl:Thing");
  foreach (XmlNode xn in xnList)
  {
    textBox1.Text = textBox1.Text + Environment.NewLine + xml.DocumentElement.InnerXml;
  }
}

but when i am runnign this code m getting error:
owl is an undeclared prefix.

how can i get this inner text.

Posted 7-Jun-15 0:18am

rukhs

Updated 7-Jun-15 1:13am

Kornfeld Eliyahu Peter

v2

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Comments

InbarBarkai 7-Jun-15 7:00am

That's because owl is an undeclare prefix (at least by what you shared with us).
If you are using a namespace in xml you need to declare on it somewhere.
The xml you've posted has no declaration of owl.

Afzaal Ahmad Zeeshan 7-Jun-15 7:35am

You missed XML namespace somewhere, or probably missed it while copy-pasting the code?

2 solutions

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-06-07T05:02:00

The answer is simple: what you call XML is not XML. A fragment of valid XML is not XML.

To understand this error, you need to understand how XML namespaces work. Here, you have the "prefix not bound with namespace" situation. You need the namespace declarations, such as

HTML

<rdf:RDF 
    xmlns     ="http://www.w3.org/TR/2004/REC-owl-guide-20040210/wine#" 
    xmlns:owl ="http://www.w3.org/2002/07/owl#"
    xmlns:rdf ="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    ...
>
   <!- ... -->
</rdf:RDF>

Please see: http://www.w3.org/TR/owl-guide[^].

Note that prefixes themselves means nothing, the can be any valid unique prefix names matching namespace declarations. Please see:
http://www.w3.org/TR/REC-xml-names[^].

—SA

Maciej Los · Answer 2 · 2015-06-07T08:46:00

Solution 2

To read owl data, you need to create proper objects using API. Here is a documentation[^].

Posted 7-Jun-15 8:46am

Maciej Los