Several researchers have considred integrating multiple unstructured,semi-structured,and structued data sources by modeling all sources as edge labeled graphs.Data in this model is self-describing and dynmaically typed,and captures both schema and data information.The labels are arbitrary atomc values,such as strings,integers,reals, etc.,and the integrated data graph is stoerf in a unique data reporsitory,as a relation of edges.The relation is dynmically typed,i.e.each edge label is tagged with its type.
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