interfaces of Monte-Carlo simulation

In this article we present a way of building fully automated Monte-Carlo simulation chain. In recent years there was a need for common place to store sophisticated MC event samples prepared by experienced theorists. Also such samples should be accessible in some standard manner to be easily imported and used in experiments ’ software. The main motivation behind the LCG MCDB project is to make sophisticated MC event samples and their structured descriptions available for various groups of physicists working on LHC. All the data from MCDB is accessible for end-users in several convenient ways from Grid, on the Web and via application program interface. HepML (High Energy Physics Markup Language), developed in collaboration of LCG MCDB and CEDAR teams and several MC generator authors, should give a unified XML description of event samples simulated by Matrix Element (ME) generators. By means of HepML, MC generators can automatically create self documented event samples. The other main purpose of HepML is to keep MC generation parameters for further MC generators tuning. It is possible to extend HepML as an XML standard to keep necessary information for the different levels of simulation in HEP, from theoretical model to a simulation of detector responds. HepML provide