+ *
+ * @section sec_alihltreconstructor_chains Custom reconstruction chains
+ * In order to run an HLT chain during the AliRoot reconstruction, a chain
+ * configuration must be defined. This can be done by
+ * - specifying a configuration macro defining a configuration macro and
+ * the name of the chain as parameters
+ * <pre>
+ * rec.SetOption("HLT", "config=[macro.C] chains=[name]")
+ * </pre>
+ * - providing the configuration and the name by the module agent.
+ * AliHLTModuleAgent and the functions AliHLTModuleAgent::CreateConfigurations
+ * and AliHLTModuleAgent::GetReconstructionChains
+ *
+ * @section sec_alihltreconstructor_hltout Treatment of HLTOUT data.
+ * The HLTOUT data is a collation of output blocks produced by the various
+ * components running in an HLT chain. Typically its the output of the last
+ * component(s) in the chain, or components specifically connected to the HLT
+ * output.
+ *
+ * The treatment of the HLTOUT data blocks is implemented in handlers of type
+ * AliHLTOUTHandler. The AliHLTModuleAgent of the module creates the appropriate
+ * handler for a data block.
+ * The data type of the individual blocks is set by the producer component and
+ * specifies the nature of the data processing. There are 5 overall groups:
+ * - output is in ESD format:
+ * @ref sec_alihltreconstructor_hltout_esd
+ * - data describes DDL raw format:
+ * @ref sec_alihltreconstructor_hltout_rawreader
+ * - pre-analyzed data to be fed into the normal reconstruction:
+ * @ref sec_alihltreconstructor_hltout_rawstream
+ * - data is fed into an analysis chain:
+ * @ref sec_alihltreconstructor_hltout_chain
+ * - detector specific handler:
+ * @ref sec_alihltreconstructor_hltout_proprietary
+ *
+ * @subsection sec_alihltreconstructor_hltout_esd ESD HLTOUT data
+ * The framework implements a standard handling of ESD data
+ * blocks of type ::kAliHLTDataTypeESDObject {ALIESDV0:ANY} and
+ * ::kAliHLTDataTypeESDTree {ESD_TREE:ANY}. Please note that the V0 refers to
+ * a foreseen version number, not the AliESDV0 class. \em ANY can be
+ * any detector origin. Each ESD block contains the data of only one event,
+ * the ESDs are merged by the AliHLTEsdManager into the hltEsd. Optionally,
+ * ESD contributions are written to files following the naming scheme
+ * AliHLT\em DET ESDs.root. This debugging feature can be enabled by option
+ * esdmanager='-writelocal -directory=dir'. The specification of target
+ * directory is optional.
+ *
+ * The module agent can provide a handler for multiple ESD data blocks, e.g.
+ * for merging within one event prior to the writing. Instead of the individual
+ * ESDs the one provided by the handler is passed to the AliHLTEsdManager. The
+ * handler is of type \link AliHLTModuleAgent::AliHLTOUTHandlerType kEsd \endlink.
+ *
+ * A specific handler AliHLTOUTHandlerEsdBranch allows to simply merge a
+ * streamed Root object into the ESD. The class can be used as-is by just
+ * specifying the data type and specification of the relevant data block and
+ * the branch name. Alternatively, a child class can implement conversion of
+ * binary data to a Root object or merging of several data blocks into one
+ * object to be added to the ESD. \b Note: in order to create the branch at
+ * the beginning of reconstruction the hltEsd layout needs to be adjusted.
+ *
+ * @subsection sec_alihltreconstructor_hltout_rawreader DDL raw HLTOUT data
+ * The HLT can perform selective readout and produces a reduced amount of data
+ * in the original raw ddl format. In order to feed this data from the HLTOUT
+ * DDL links into the normal reconstruction, a handler of type
+ * \link AliHLTModuleAgent::AliHLTOUTHandlerType kRawReader \endlink must be
+ * implemented and provided by the
+ * module agent. The handler has to derive the original equipment id from the
+ * data type and specification of the block. The offline reconstruction does
+ * not need to be changed or adapted at all. See AliRawReaderHLT for details.
+ *
+ * @subsection sec_alihltreconstructor_hltout_rawstream Preprocessed Raw HLTOUT data
+ * Handlers of type \link AliHLTModuleAgent::AliHLTOUTHandlerType kRawStream \endlink
+ * are foreseen though at the time of writing (May 08) the
+ * concept is not fixed. Advanced data compression algorithms can produce a
+ * raw data format which is not convertible into the raw DDL data, e.g. lossy
+ * compression techniques storing clusters parametrized regarding to tracks. A
+ * specific RawStream is needed here since the data is detector specific and the
+ * first stage of the offline reconstruction might need some adaptions.
+ *
+ * @subsection sec_alihltreconstructor_hltout_chain HLTOUT data fed into a chain
+ * Handlers of type \link AliHLTModuleAgent::AliHLTOUTHandlerType kChain \endlink
+ * can execute a normal HLT chain and thus process HLTOUT data blocks by normal
+ * HLT components just as if the components were running on-line. The base class
+ * is provided by AliHLTOUTHandlerChain and can be used as it is just specifying
+ * the chain to be run.<br>
+ * Example:
+ *
+ * @subsection sec_alihltreconstructor_hltout_proprietary Proprietary HLTOUT data
+ * This is a handler of proprietary detector data. Handlers of type
+ * \link AliHLTModuleAgent::AliHLTOUTHandlerType kProprietary \endlink
+ * do not have any standard output to the framework. Data can be processed and
+ * stored to files.
+ *
+ * @section sec_alihltreconstructor_helper Tools and helper functions
+ * Some helper functions of the AliHLTReconstruction can be used in stand-alone
+ * mode. Remember to Init() the reconstructor.
+ * <pre>
+ * {
+ * gSystem->Load("libHLTrec.so");
+ * AliHLTReconstructor rec;
+ * rec.Init();
+ * // do something
+ * }
+ * </pre>
+ * @subsection sec_alihltreconstructor_hltout_standalone Stand-alone HLTOUT processing
+ * - HLTOUT processing from a digit file:
+ * <pre>
+ * void ProcessHLTOUT(const char*, AliESDEvent*) const;
+ * </pre>
+ * - HLTOUT processing from an AliRawReader
+ * <pre>
+ * void ProcessHLTOUT(AliRawReader*, AliESDEvent*) const;
+ * </pre>
+ *
+ * @ingroup alihlt_aliroot_reconstruction
+ * @section sec_alihltreconstructor_members Class members