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// DocumentFragment.h
//
// Library: XML
// Package: DOM
// Module: DOM
//
// Definition of the DOM DocumentFragment class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef DOM_DocumentFragment_INCLUDED
#define DOM_DocumentFragment_INCLUDED
#include "Poco/XML/XML.h"
#include "Poco/DOM/AbstractContainerNode.h"
#include "Poco/XML/XMLString.h"
namespace Poco {
namespace XML {
class XML_API DocumentFragment: public AbstractContainerNode
/// DocumentFragment is a "lightweight" or "minimal" Document object. It is
/// very common to want to be able to extract a portion of a document's tree
/// or to create a new fragment of a document. Imagine implementing a user command
/// like cut or rearranging a document by moving fragments around. It is desirable
/// to have an object which can hold such fragments and it is quite natural
/// to use a Node for this purpose. While it is true that a Document object
/// could fulfill this role, a Document object can potentially be a heavyweight
/// object, depending on the underlying implementation. What is really needed
/// for this is a very lightweight object. DocumentFragment is such an object.
///
/// Furthermore, various operations -- such as inserting nodes as children of
/// another Node -- may take DocumentFragment objects as arguments; this results
/// in all the child nodes of the DocumentFragment being moved to the child
/// list of this node.
///
/// The children of a DocumentFragment node are zero or more nodes representing
/// the tops of any sub-trees defining the structure of the document. DocumentFragment
/// nodes do not need to be well-formed XML documents (although they do need
/// to follow the rules imposed upon well-formed XML parsed entities, which
/// can have multiple top nodes). For example, a DocumentFragment might have
/// only one child and that child node could be a Text node. Such a structure
/// model represents neither an HTML document nor a well-formed XML document.
///
/// When a DocumentFragment is inserted into a Document (or indeed any other
/// Node that may take children) the children of the DocumentFragment and not
/// the DocumentFragment itself are inserted into the Node. This makes the DocumentFragment
/// very useful when the user wishes to create nodes that are siblings; the
/// DocumentFragment acts as the parent of these nodes so that the user can
/// use the standard methods from the Node interface, such as insertBefore and
/// appendChild.
{
public:
// Node
const XMLString& nodeName() const;
unsigned short nodeType() const;
protected:
DocumentFragment(Document* pOwnerDocument);
DocumentFragment(Document* pOwnerDocument, const DocumentFragment& fragment);
~DocumentFragment();
Node* copyNode(bool deep, Document* pOwnerDocument) const;
private:
static const XMLString NODE_NAME;
friend class Document;
};
} } // namespace Poco::XML
#endif // DOM_DocumentFragment_INCLUDED
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