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Copyright (C) 2011-2012 Jason Hunter & Brett McLaughlin.
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* JDOM2 introduces a consistency in reporting Namespace context. XML standards
* do not dictate any conditions on Namespace reporting or ordering, but
* consistency is valuable for user-friendliness. As a result JDOM2 imposes a
* useful order on the Namespace context for XML content.
*
* The order for Namespace reporting is:
*
* - If the item 'has' a Namespace (Element, Attribute) then that Namespace is
* reported.
*
- The remaining Namespaces are reported in alphabetical order by prefix.
*
*
* The XML namespace (bound to the prefix "xml" - see
* {@link Namespace#XML_NAMESPACE} ) is always in every scope. It is always
* introduced in {@link Document}, and in all other NamespaceAware instances it
* is introduced if that content is detached.
*
* See the individualised documentation for each implementing type for
* additional specific details. The following section is a description of how
* Namespaces are managed in the Element class.
*
*
The Element Namespace Scope
* The 'default' Namespace is a source of confusion, but it is simply the
* Namespace which is in-scope for an Element that has no Namespace prefix
* (prefix is "" but it could have any Namespace URI). There will always be
* exactly one Namespace that is in-scope for an element that has no prefix.
*
* All Elements are in a Namespace. Elements will be in
* {@link Namespace#NO_NAMESPACE} unless a different Namespace was supplied as
* part of the Element Constructor, or later modified by the
* {@link Element#setNamespace(Namespace)} method.
*
* In addition to the Element's Namespace, there could be other Namespaces that
* are 'in scope' for the Element. The set of Namespaces that are in scope for
* an Element is the union of five sets:
*
*
* XML
*
* There is always exactly one member of this set,
* {@link Namespace#XML_NAMESPACE}.
*
* This set cannot be changed.
*
*
*
* Element
*
* There is always exactly one member of this set, and it can be retrieved
* or set with the methods {@link Element#getNamespace()} and
* {@link Element#setNamespace(Namespace)} respectively.
*
*
*
* Attribute
*
* This is the set of distinct Namespaces that are used on Attributes. You
* can modify the set by adding and removing Attributes to the Element.
*
* NOTE:
* The {@link Namespace#NO_NAMESPACE Namespace.NO_NAMESPACE} Namespace is always the
* default Namespace for attributes (the Namespace that has no
* prefix). Thus there may be a special case with this Namespace, because
* if there is a different default Namespace for the Element, then
* the Namespace.NO_NAMESPACE Namespace is not part of the Element's in-scope
* Namespace set (the Element cannot have two Namespaces in scope with the
* same prefix - "").
*
*
*
* Additional
*
* This set is maintained by the two methods {@link Element#addNamespaceDeclaration(Namespace)}
* and {@link Element#removeNamespaceDeclaration(Namespace)}. You can get the full set
* of additional Namespaces with {@link Element#getAdditionalNamespaces()}
*
*
*
* Inherited
*
* This last set is somewhat dynamic because only those Namespaces on the
* parent Element which are not re-defined by this Element will be
* inherited. A Namespace is redefined by setting a new Namespace with the
* same prefix, but a different URI. If you set a Namespace on the Element
* (or add a Namespace declaration or set an Attribute) with the same
* prefix as another Namespace that would have been otherwise inherited,
* then that other Namespace will no longer be inherited.
*
*
*
*
*
* Since you cannot change the Namespace.XML_NAMESPACE, and the 'inherited' Namespace set
* is dynamic, the remaining Namespace sets are the most interesting from a JDOM
* perspective. JDOM validates all modifications that affect the Namespaces in
* scope for an Element. An IllegalAddException will be thrown if you attempt to
* add a new Namespace to the in-scope set if a different Namespace with the
* same prefix is already part of one of these three sets (Element, Attribute,
* or Additional).
*
*
* @author Rolf Lear
* @since JDOM2
*/
public interface NamespaceAware {
/**
* Obtain a list of all namespaces that are in scope for the current
* content.
*
* The contents of this list will always be the combination of
* getNamespacesIntroduced() and getNamespacesInherited().
*
* See {@link NamespaceAware} documentation for details on what the order of the
* Namespaces will be in the returned list.
*
* @return a read-only list of Namespaces.
*/
public List getNamespacesInScope();
/**
* Obtain a list of all namespaces that are introduced to the XML tree by
* this node. Only Elements and Attributes can introduce namespaces, so all
* other Content types will return an empty list.
*
* The contents of this list will always be a subset (but in the same order)
* of getNamespacesInScope(), and will never intersect
* getNamspacesInherited()
*
* @return a read-only list of Namespaces.
*/
public List getNamespacesIntroduced();
/**
* Obtain a list of all namespaces that are in scope for this content, but
* were not introduced by this content.
*
* The contents of this list will always be a subset (but in the same order)
* of getNamespacesInScope(), and will never intersect
* getNamspacesIntroduced()
*
* @return a read-only list of Namespaces.
*/
public List getNamespacesInherited();
}