This class is a repository for constants defined by various XML standards. Most are URIs that identify XML namespaces.

public final class XMLConstants {
// No Constructor
// Public Constants
     public static final String DEFAULT_NS_PREFIX; =" "
     public static final String FEATURE_SECURE_PROCESSING;
      ="http://javax.xml.XMLConstants/feature/secure-processing" 
     public static final String NULL_NS_URI;    =" " 
     public static final String RELAXNG_NS_URI; ="http://relaxng.org/ns/structure/1.0" 
     public static final String W3C_XML_SCHEMA_INSTANCE_NS_URI; 
     ="http://www.w3.org/2001/XMLSchema-instance" 
     public static final String W3C_XML_SCHEMA_NS_URI; ="http://www.w3.org/2001/XMLSchema"
     public static final String W3C_XPATH_DATATYPE_NS_URI; 
      ="http://www.w3.org/2003/11/xpath-datatypes"
     public static final String XML_DTD_NS_URI;      ="http://www.w3.org/TR/REC-xml"
     public static final String XML_NS_PREFIX;       ="xml"
     public static final String XML_NS_URI;          ="http://www.w3.org/XML/1998/namespace" 
     public static final String XMLNS_ATTRIBUTE;     ="xmlns"
     public static final String XMLNS_ATTRIBUTE_NS_URI; ="http://www.w3.org/2000/xmlns/"
}