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theory for LDM
OO data model that generalizes the relational hierarchical and network
review of 7 other attempts
none provide both conceptual data and a well defined retrieval mechanism/query language
defines a DB schema as a digraph. leaves are dta, internal nodes are connections from objects with separate names and values.
sect 2 intro, sectn 3 math defs, sectn 4 logic og LDM, sectn 5 & 6 query languages
Strong theoretical foundation for future DBMSs
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