XMLConstants

AI-generated Key Takeaways

• XMLConstants is a utility class providing constant values for common XML elements like namespaces, schema URIs, and security features.

• This class defines constants representing standard XML values, including prefixes, namespace URIs, and the feature for secure processing.

• The constants are based on official XML specifications from W3C, including those related to namespaces, XML Schema, and XPath datatypes.

• XMLConstants is primarily used to ensure consistency and interoperability when working with XML documents in Java.

• Developers can leverage these constants when configuring XML processors, validating documents, or interacting with XML APIs.

public final class XMLConstants extends Object

Utility class to contain basic XML values as constants.

See Also

• Extensible Markup Language (XML) 1.1
• Extensible Markup Language (XML) 1.0 (Second Edition)
• XML 1.0 Second Edition Specification Errata
• Namespaces in XML 1.1
• Namespaces in XML
• Namespaces in XML Errata
• XML Schema Part 1: Structures

Constant Summary

String	DEFAULT_NS_PREFIX	Prefix to use to represent the default XML Namespace.
String	FEATURE_SECURE_PROCESSING	Feature for secure processing.
String	NULL_NS_URI	Namespace URI to use to represent that there is no Namespace.
String	RELAXNG_NS_URI	RELAX NG Namespace URI.
String	W3C_XML_SCHEMA_INSTANCE_NS_URI	W3C XML Schema Instance Namespace URI.
String	W3C_XML_SCHEMA_NS_URI	W3C XML Schema Namespace URI.
String	W3C_XPATH_DATATYPE_NS_URI	W3C XPath Datatype Namespace URI.
String	XMLNS_ATTRIBUTE	The official XML attribute used for specifying XML Namespace declarations.
String	XMLNS_ATTRIBUTE_NS_URI	The official XML attribute used for specifying XML Namespace declarations, XMLConstants.XMLNS_ATTRIBUTE, Namespace name URI.
String	XML_DTD_NS_URI	XML Document Type Declaration Namespace URI as an arbitrary value.
String	XML_NS_PREFIX	The official XML Namespace prefix.
String	XML_NS_URI	The official XML Namespace name URI.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Constants

public static final String DEFAULT_NS_PREFIX

Prefix to use to represent the default XML Namespace.

Defined by the XML specification to be "".

See Also

• Namespaces in XML, 3. Qualified Names

Constant Value: ""

public static final String FEATURE_SECURE_PROCESSING

Feature for secure processing.

• true instructs the implementation to process XML securely. This may set limits on XML constructs to avoid conditions such as denial of service attacks.
• false instructs the implementation to process XML according to the letter of the XML specifications ignoring security issues such as limits on XML constructs to avoid conditions such as denial of service attacks.

Constant Value: "http://javax.xml.XMLConstants/feature/secure-processing"

public static final String NULL_NS_URI

Namespace URI to use to represent that there is no Namespace.

Defined by the Namespace specification to be "".

See Also

• Namespaces in XML, 5.2 Namespace Defaulting

Constant Value: ""

public static final String RELAXNG_NS_URI

RELAX NG Namespace URI.

Defined to be "http://relaxng.org/ns/structure/1.0".

See Also

• RELAX NG Specification

Constant Value: "http://relaxng.org/ns/structure/1.0"

public static final String W3C_XML_SCHEMA_INSTANCE_NS_URI

W3C XML Schema Instance Namespace URI.

Defined to be "http://www.w3.org/2001/XMLSchema-instance".

See Also

• XML Schema Part 1: Structures, 2.6 Schema-Related Markup in Documents Being Validated

Constant Value: "http://www.w3.org/2001/XMLSchema-instance"

public static final String W3C_XML_SCHEMA_NS_URI

W3C XML Schema Namespace URI.

Defined to be "http://www.w3.org/2001/XMLSchema".

See Also

• XML Schema Part 1: Structures, 2.6 Schema-Related Markup in Documents Being Validated

Constant Value: "http://www.w3.org/2001/XMLSchema"

public static final String W3C_XPATH_DATATYPE_NS_URI

W3C XPath Datatype Namespace URI.

Defined to be "http://www.w3.org/2003/11/xpath-datatypes".

See Also

• XQuery 1.0 and XPath 2.0 Data Model

Constant Value: "http://www.w3.org/2003/11/xpath-datatypes"

public static final String XMLNS_ATTRIBUTE

The official XML attribute used for specifying XML Namespace declarations.

It is NOT valid to use as a prefix. Defined by the XML specification to be "xmlns".

See Also

• Namespaces in XML, 3. Qualified Names

Constant Value: "xmlns"

public static final String XMLNS_ATTRIBUTE_NS_URI

The official XML attribute used for specifying XML Namespace declarations, XMLConstants.XMLNS_ATTRIBUTE, Namespace name URI.

Defined by the XML specification to be "http://www.w3.org/2000/xmlns/".

See Also

• Namespaces in XML, 3. Qualified Names
• Namespaces in XML Errata

Constant Value: "http://www.w3.org/2000/xmlns/"

public static final String XML_DTD_NS_URI

XML Document Type Declaration Namespace URI as an arbitrary value.

Since not formally defined by any existing standard, arbitrarily define to be "http://www.w3.org/TR/REC-xml".

Constant Value: "http://www.w3.org/TR/REC-xml"

public static final String XML_NS_PREFIX

The official XML Namespace prefix.

Defined by the XML specification to be "xml".

See Also

• Namespaces in XML, 3. Qualified Names

Constant Value: "xml"

public static final String XML_NS_URI

The official XML Namespace name URI.

Defined by the XML specification to be "http://www.w3.org/XML/1998/namespace".

See Also

• Namespaces in XML, 3. Qualified Names

Constant Value: "http://www.w3.org/XML/1998/namespace"