This class contains document context information normally provided by both the XML declaration and DOCTYPE elements for parsing XML fragments. XmlTextReader and XmlValidatingReader use the XmlParserContext for the base URI, internal subset, public and system identifiers, etc.

public class XmlParserContext {
// Public Constructors
   public XmlParserContext(XmlNameTable
   nt, XmlNamespaceManager
   nsMgr, string
   docTypeName, 
       string pubId, string sysId, string internalSubset, 
        string baseURI, string xmlLang, XmlSpace xmlSpace);
   public XmlParserContext(XmlNameTable nt, XmlNamespaceManager nsMgr, string docTypeName, 
       string pubId,
       string sysId, string internalSubset, string baseURI, string xmlLang, XmlSpace xmlSpace, 
       System.Text.Encoding enc);
   public XmlParserContext(XmlNameTable nt, XmlNamespaceManager nsMgr, string xmlLang,
       XmlSpace xmlSpace);
   public XmlParserContext(XmlNameTable nt, XmlNamespaceManager nsMgr, string xmlLang, 
       XmlSpace xmlSpace, System.Text.Encoding enc);
// Public Instance Properties
   public string BaseURI{set; get; }
   public string DocTypeName{set; get; }
   public Encoding Encoding{set; get; }
   public string InternalSubset{set; get; }
   public XmlNamespaceManager NamespaceManager{set; get; }
   public XmlNameTable NameTable{set; get; }
   public string PublicId{set; get; }
   public string SystemId{set; get; }
   public string XmlLang{set; get; }
   public XmlSpace XmlSpace{set; get; }
}

Passed To

XmlTextReader.XmlTextReader( ), XmlValidatingReader.XmlValidatingReader( )