Has been described as a ‘data commons’, or more usually a Web of Data.
Problem for machines to extract meaning. At present, the raw data is not really available.
Persitent URIs for names of things – http URIs are names, not addressesProvide information – properties and classes for a URIMore links
Things are resources because someone created a URI to identify them, not because they have some particular properties in and of themselves.HTTP URIs provide a simple way to create globally unique names without centralized management; and URIs work not just as a name but also as a means of accessing information about a resource over the Web
In a data graph, there is no concept of roots (or a hierarchy). A graph consists of resources related to other resources, with no single resource having any particular intrinsic importance over another.
This subject – the archive itself – has a page (foaf:page being the property) with name ‘finding aid’. The ‘finding aid’ is the object of this statement, but is also itself a subject. A subject in an RDF document may also be referenced as an object of a property in another RDF statement.
We have four ‘things’ here: unit of description; repostiory; finding aid; EAD document. We have given Unit of description a number of properties. Other things can also have properties (this is simplified)These properties are indicated in the green boxes. They are also called predicates.
In hypertext web sites it is considered generally rather bad etiquette not to link to related external material. The value of your own information is very much a function of what it links to, as well as the inherent value of the information within the web page. So it is also in the Semantic Web.Remember, this is about machines linking – machines need identifiers; humans generally know when something is a place or when it is a person. BBC + DBPedia + GeoNames + Archives Hub + Copac + VIAF = the Web as an exploratory space
Once you say that they are the same, the implication is that they share the same classes and properties.
Ontology defines a ‘knowledge domain’
Encoded Archival Description is an XML standard for encoding archival finding aidsThe Object Description Schema (MODS) is an XML-based bibliographic description schemaMODS - Metadata Object Description Schema (MODS) is a schema for a bibliographic element set that may be used for a variety of purposes, and particularly for library applications.EAD - Things” include concepts and abstractions as well as material objects We want location – archives physical things so location importantAlso wanted event data, partly steered by the visualisation prototypeAlso ‘extent’ data – number of boxes
303 and Content Neg from ‘Cool URIs for the Semantic Web’
Open Data Commons Public Domain DedicationCreative Commons CC0 license
e.g. index terms may not always apply down the hierarchy of the descriptionWe are pulling <repository> down into lower-level descriptions