Articles by Oreste Signore

Knowledge has been the driving force behind the Italian National Catalogue of Cultural Heritage. In the first stage, when the catalogue was mainly based on hand written paper cards describing objects regardless of their complexity, and intended for manual access by humans, the expert’s tacit knowledge remained unexpressed, and the card had a simple structure. Computer based applications initially relied on the features of Information Retrieval Systems, and simply converted typewritten cards into electronic documents. As results were quite disappointing, it became evident that a more formal representation of information was needed. The Italian experience led to the definition of a model for objects (simple, complex, aggregation of objects) with quite a large number of fields. Even if the schema was often perceived as too rigid, it proved to be effective for data exchange, and long lasting (the present XML model is almost the same, just with a different syntax). However, its main drawback was the "object centred" approach, and the impossibility of representing significant semantic associations with other disciplines. In this sense, a major objective, the contextualization of objects, remained unattained. The web has been a "cultural revolution", because information is available everywhere, and users feel the need to combine different sources of knowledge. This semantic interoperability issue is often dealt with by adopting a metadata based approach (Dublin Core is the most popular). However, the metadata approach has the intrinsic limit that metadata are properties we "predicate" about items they refer to, and it is difficult, if not impossible, to derive new knowledge from the old. The Semantic Web perspective is much more ambitious, as the aim is to represent, export and share knowledge in a "machine understandable" way, and to allow intelligent agents to reason about it. In this light, scholars’ knowledge must be formalized and made explicit as ontology, and very probably we will have to agree on a different model to represent objects, in a distributed and multicultural environment. This is not the end of the traditional scholars’ knowledge, but a more effective environment for making this knowledge available to all users.

A virtual museum is a real challenge, especially when the goal is to contextualize its content and overcome physical, cognitive and cultural hurdles. A good user interface should provide everyone with an equivalent experience, irrespective of their disabilities. On the other hand, disability is a stage in everyone’s life. Web accessibility has several components, and is not merely a technical issue. A good quality web site should be designed for usable accessibility, considering both usability and accessibility issues, giving to the disabled user the sense of inclusion and equal opportunity to participate. Web accessibility has been a concern to several governments, and in many countries accessibility is required by law. The World Wide Web Consortium (W3C) has provided web accessibility guidelines since the birth of the web, addressing all the web accessibility components. Presently a new release of WCAG is going to be issued, characterized by several important novelties (baseline, conformance level, etc.), which will be a big step forward from the previous WCAG. W3C Recommendations also include some accessibility features for 2D graphics and multimedia. The Rich Internet Applications are emerging, and W3C defined a roadmap towards a declarative markup. To overcome the difficulties related to different cultures, Semantic Web technologies and ontologies can give the appropriate support for exchanging and sharing knowledge.

Despite the fact that an increasing number of researchers in the cultural heritage sector is recognising the advantages that could derive from the use of knowledge management methodologies and tools, a lack of awareness of the basic principles of this discipline is still rather evident. Key concepts like “knowledge representation”, metadata, conceptual modeling, syntactic or semantic interoperability, ontologies, can prove difficult to understand (and even more difficult to apply) for researchers with a background in the humanities. This contribution, therefore, aims at clarifying the theoretical reference framework through the concrete analysis of archaeological materials. In fact, while it seems easier to borrow definitions and theoretical concepts or to artificially create even very complex conceptual models (e.g. the CIDOC CRM, which has recently been recognised as an ISO standard), it is a lot harder to implement such principles onto real world objects analysis. According to this assessment, and to the need of going from theoretical to practical aspects, the paper is structured in three parts: the first offers a theoretical base that makes available, even for non-experts, the tools for addressing more operational aspects; the second describes, through practical examples, both the knowledge representation model and the software tool used for analysing a class of materials, the Etruscan urns, as shown in the third part. The final objective is, therefore, to provide a point of reference for facilitating the approach towards KM (Knowledge Management) and help clarifying the key elements of a discipline that is obtaining a growing success but, so far, still showing a high level of entropy.