Abstract
In this paper we describe a HepML format and a corresponding C++ library
developed for keeping complete description of parton level events in a unified
and flexible form. HepML tags contain an information enough to understand what
kind of physics the simulated events describe and how the events have been
prepared. A HepML block is an additional part to the LHEF format of event
files. The structure of the HepML block is described by means of several XML
Schemas. The Schemas define necessary information for the HepML block and how
this information should be located within the block. The library libhepml is a
C++ library intended for parsing and serialization of HepML tags, and
representing the HepML block in computer memory. The library is an API for an
external software. For example, Matrix Element Monte Carlo event generators can
prepare and write a header of a LHEF file. In turn, Showering and Hadronization
event generators can parse the HepML header and get the information in the form
of C++ classes. libhepml can be used in C++, C, and Fortran programs. All
necessary parts of HepML have been prepared and we present the project to the
HEP community.
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