The web is a universal space where a huge amount of information is daily published. Digital Archives (DA) constitute a valuable documentary domain to be propagated through the web. But the virtual integration of web heterogeneous data sources is a difficult task nowadays. This paper deals with the semantic integration of many specific DA ontologies. Beforehand, we have proposed a virtual and dynamic web integrated architecture, based on Mediator and Wrapper layers. This paper is focused on a Unified DA Ontological Proposal allocated at the mediator layer. Coming from the ISAD (G) and ISAAR (CPF) International Archival Standards, two specific archival ontologies: ISAD-O and ISAAR-O are introduced. Besides, we have built the Integrated Parliamentary Management System, SIAP1 (successfully running at the Asamblea of Madrid since 1999) that contains a powerful parliamentary archive system. From it, we have built the SIAP-O specific parliamentary archive ontology. Above all these ontologies, a Global Ontological Kernel (GOK) is here introduced. The GOK, as a unifying umbrella, provides the attachment of many pre-existing specific DA ontologies. In the future, this GOK will make possible that the user query will be firstly pre-processed against to a personalized ontology, inferred from the GOK and tailored to each web user preference?s profile.