We present the International Lattice Data Grid (ILDG), a loosely federated grid of grids for sharing data from Lattice Quantum Chromodynamics (LQCD) simulations. The ILDG comprises of metadata, file format and web-service standards, which can be used to wrap regional data-grid interfaces, allowing seamless access to catalogues and data in a diverse set of collaborating regional grids. We discuss the technological underpinnings of the ILDG, primarily the metadata and the middleware, and offer a critique of its various aspects with the hindsight of the design work and the first full year of production.
@article{arxiv.0910.1692,
title = {Building the International Lattice Data Grid},
author = {G. Beckett and B. Joo and C. M. Maynard and D. Pleiter and O. Tatebe and T. Yoshie},
journal= {arXiv preprint arXiv:0910.1692},
year = {2011}
}