| http://www.w3.org/ns/prov#value | - This volume is a collection of papers, most of them written in English and Spanish, which were originally presented at the Segundo Symposium Heracliteum held in Mexico City in June 2006.1 It is prefaced by Enrique H??lsz Piccone, the organiser of the colloquium, and consists of sixteen studies differing widely in length, topic and approach.
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