(required) Template of the top-level NeXus group which contains all the data and associated information that comprise a single measurement. It is mandatory that there is at least one group of this type in the NeXus file. ISIS Muon IDF_Version Extended title for entry Unique identifier for the experiment, defined by the facility, possibly linked to the proposals Brief summary of the experiment, including key objectives. Description of the full experiment (document in pdf, latex, …) User or Data Acquisition defined group of NeXus files or NXentry Brief summary of the collection, including grouping criteria. unique identifier for the measurement, defined by the facility. (alternate use: see same field in NXsubentry for preferred) Official NeXus NXDL schema to which this file conforms. This field is provided so that NXentry can be the overlay position in a NeXus data file for an application definition and its set of groups, fields, and attributes. It is advised to use NXsubentry, instead, as the overlay position. NXDL version number URL of NXDL file (deprecated use: see same field in NXsubentry for preferred) Local NXDL schema extended from the file specified in the definition field. This contains any locally-defined, additional fields in the file. NXDL version number URL of NXDL file Starting time of measurement Ending time of measurement Duration of measurement Time transpired actually collecting data i.e. taking out time when collection was suspended due to e.g. temperature out of range Such as "2007-3". Some user facilities organize their beam time into run cycles. Name of program used to generate this file Program version number configuration of the program Revision id of the file due to re-calibration, reprocessing, new analysis, new instrument definition format, ... This is the flightpath before the sample position. This can be determined by a chopper, by the moderator or the source itself. In other words: it the distance to the component which gives the T0 signal to the detector electronics. If another component in the NXinstrument hierarchy provides this information, this should be a link. Notes describing entry A small image that is representative of the entry. An example of this is a 640x480 jpeg image automatically produced by a low resolution plot of the NXdata. The value should be an "image/*"