Conventions for markovChainURI and dataLFN (19.12.2005)
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For LDG the following conventions are adopted:

* markovChainURI:

  mc://ldg/<collaboration>/<project>/<ensemble>

* dataLFN:

  lfn://ldg/<collaboration>/<project>/<ensemble>/<filename>

Where

  <collaboration> ... Physics ollaboration (e.g. 'alpha', 'qcdsf', 'gral' ...)
  <project> ......... Name of the project
  <ensemble> ........ Name of ensemble
  <filename> ........ Name of file

Comments:
* All the elements are supposed to consist of alpha-numeric characters
  or the following characters: '+', '-', '_', '.' (i.e. the following
  following regular expression should match: '[[:alnum:]+-_.]+').
* The collaborations are otherwise free to choose the elements <project>,
  <ensemble> and <filename> as the collaboration name defines a globally
  unique namespace.
* In the file catalogue the dataLFN 'lfn://ldg/...' is mapped to
  '/grid/ildg/ldg/...'