javax.xml

Class XMLConstants

public class XMLConstants extends Object

This class contains a set of constants, as specified by various W3C and other standards.

Since: JAXB 1.0

Author: JSR-31

Field Summary
static StringDEFAULT_NS_PREFIX

This constant is used to represent the default namespace.

static StringXMLNS_ATTRIBUTE

Constant holding the attribute name for declaration of new prefixes.

static StringXMLNS_ATTRIBUTE_NS_URI

Constant holding the namespace of the "xmlns" attribute: "http://www.w3.org/2000/xmlns/".

Note: This namespace will always be used for the attribute, regardless whether you used it as an attribute name (as in xmlns="..." or as an attribute prefix (as in xmlns:pre="...").

static StringXML_NS_PREFIX

Constant holding the reserved "xml" prefix.

static StringXML_NS_URI

Constant holding the reserved namespace URI associated with the "xml" prefix.

Field Detail

DEFAULT_NS_PREFIX

public static final String DEFAULT_NS_PREFIX

This constant is used to represent the default namespace. Elements or attributes in the default namespace are sometimes also referred as "having no namespace". The constant value is "" (the empty string).

Note: The default namespace is used like this in SAX handlers. Note, that DOM uses null to represent the default namespace, hence a different value.

XMLNS_ATTRIBUTE

public static final String XMLNS_ATTRIBUTE

Constant holding the attribute name for declaration of new prefixes. The constant value is "xmlns".

Note: This is both an attribute name and a namespace prefix: For example, to assign the empty prefix to a namespace, one would use

   xmlns="http://my.namespace/..."
 
But for assigning the prefix "pre" to the same namespace, one would use
   xmlns:pre="http://my.namespace/..."
 

XMLNS_ATTRIBUTE_NS_URI

public static final String XMLNS_ATTRIBUTE_NS_URI

Constant holding the namespace of the "xmlns" attribute: "http://www.w3.org/2000/xmlns/".

Note: This namespace will always be used for the attribute, regardless whether you used it as an attribute name (as in xmlns="..." or as an attribute prefix (as in xmlns:pre="...").

XML_NS_PREFIX

public static final String XML_NS_PREFIX

Constant holding the reserved "xml" prefix. This prefix is reserved by the XML namespace standard. Unlike other prefixes, this one is fixed and will always be associated with the same namespace, {@link #XML_NS_URI}. Namespace and prefix are reserved by the XML namespace standard for use by the XML specifications.

Note: Not only the prefix "xml" itself is reserved, but also any other prefix beginning with "xml". For example, a "new_prefix" may be declared in an XML instance by using the attribute "xmlns:new_prefix".

XML_NS_URI

public static final String XML_NS_URI

Constant holding the reserved namespace URI associated with the "xml" prefix. Namespace and prefix are reserved by the XML namespace standard for use by the XML specifications.