WP3: Fact Extractor Scheme Progress Report CROSSMARC Fourth Meeting Athens 28 February-1 March 2002

FE Scheme: overview Main goal To describe expected FE output format (structure agreement) To validate a description of a product offer (content agreement) Design choices Three (or four) parts Basic types Ontology types (domain) NERC constraints (language) FE Scheme (task)

FE Scheme: diagram 28 different tags under prodDesc

FE Scheme: component level tags batteryLife batteryMake cardCategory cardNumber cdromSpeed depth dvdSpeed floppyMake hdCapacity height is_model made_by modemSpeed pointDevice port preinstalledOS price processorMake processorSpeed ram screenMake screenResolution screenSize soundSupport videoOut warranty weight width

FE Scheme: element Types

FE Scheme: ontology types

FE Scheme: basic types

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FE Scheme: current issues Numerical expression normalization retain the original unit be expressed in a standard one Content validation Numerical expression measure units (OK) Range checking (TO BE DONE) Named entities Closed sets (OK) Open sets (no way, rely on normalization)

FE Scheme: current issues Choose a set of features to be represented Not all the ontology attributes must be included in the final description Maybe the same holds for normalization FE output Mixed content model vs pure XML model Fix order tags vs free order tags Retain some physical structure or not The last issue is IMPORTANT for multiple values