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87 lines
3.3 KiB
C++
87 lines
3.3 KiB
C++
//
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// DTDHandler.h
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//
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// Library: XML
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// Package: SAX
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// Module: SAX
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//
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// SAX DTDHandler Interface.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef SAX_DTDHandler_INCLUDED
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#define SAX_DTDHandler_INCLUDED
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#include "Poco/XML/XML.h"
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#include "Poco/XML/XMLString.h"
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namespace Poco {
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namespace XML {
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class XML_API DTDHandler
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/// If a SAX application needs information about notations and unparsed entities,
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/// then the application implements this interface and registers an instance with the
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/// SAX parser using the parser's setDTDHandler method. The parser uses the instance
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/// to report notation and unparsed entity declarations to the application.
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///
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/// Note that this interface includes only those DTD events that the XML recommendation
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/// requires processors to report: notation and unparsed entity declarations.
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///
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/// The SAX parser may report these events in any order, regardless of the order in
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/// which the notations and unparsed entities were declared; however, all DTD events
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/// must be reported after the document handler's startDocument event, and before the first
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/// startElement event. (If the LexicalHandler is used, these events must also be reported before the endDTD event.)
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///
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/// It is up to the application to store the information for future use (perhaps in a hash table or
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/// object tree). If the application encounters attributes of type "NOTATION", "ENTITY", or "ENTITIES",
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/// it can use the information that it obtained through this interface to find the entity and/or notation
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/// corresponding with the attribute value.
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{
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public:
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virtual void notationDecl(const XMLString& name, const XMLString* publicId, const XMLString* systemId) = 0;
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/// Receive notification of a notation declaration event.
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///
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/// It is up to the application to record the notation for later reference,
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/// if necessary; notations may appear as attribute values and in unparsed
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/// entity declarations, and are sometime used with processing instruction
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/// target names.
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///
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/// At least one of publicId and systemId must be non-null. If a system identifier
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/// is present, and it is a URL, the SAX parser must resolve it fully before passing
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/// it to the application through this event.
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///
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/// There is no guarantee that the notation declaration will be reported before any
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/// unparsed entities that use it.
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///
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/// Note that publicId and systemId maybe null, therefore we pass a pointer rather than a reference.
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virtual void unparsedEntityDecl(const XMLString& name, const XMLString* publicId, const XMLString& systemId, const XMLString& notationName) = 0;
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/// Receive notification of an unparsed entity declaration event.
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///
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/// Note that the notation name corresponds to a notation reported by the
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/// notationDecl event. It is up to the application to record the entity for
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/// later reference, if necessary; unparsed entities may appear as attribute values.
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///
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/// If the system identifier is a URL, the parser must resolve it fully before
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/// passing it to the application.
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///
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/// Note that publicId maybe null, therefore we pass a pointer rather than a reference.
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protected:
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virtual ~DTDHandler();
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};
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} } // namespace Poco::XML
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#endif // SAX_DTDHandler_INCLUDED
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