ERROL (an acronym for Entity Relationship Role Oriented Language) is a declarative database query and manipulation language for the Entity-relationship model . It is applicable to any data model on which ERM can be mapped, virtually any general purpose database data model. It is based on the capability of ER diagrams to be described accurately by simple Natural language sentences. A specification of a complex operation upon an ERM database can be described accurately by a complex and/or compound NL sentence constructed from the simple sentences describing the respective ER diagram. An ERROL expression mimics such NL sentence with one-to-one correspondence between ERROL subexpressions and NL subsentences: An ERROL expression can look like the corresponding NL sentence, or at least like a similar, equivalent one. This allows to write in ERROL very complex queries by simple conversion from their NL specifications. It also allows a straightforward checking of an ERROL expression meeting a complex NL specification.

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  • ERROL (an acronym for Entity Relationship Role Oriented Language) is a declarative database query and manipulation language for the Entity-relationship model . It is applicable to any data model on which ERM can be mapped, virtually any general purpose database data model. It is based on the capability of ER diagrams to be described accurately by simple Natural language sentences. A specification of a complex operation upon an ERM database can be described accurately by a complex and/or compound NL sentence constructed from the simple sentences describing the respective ER diagram. An ERROL expression mimics such NL sentence with one-to-one correspondence between ERROL subexpressions and NL subsentences: An ERROL expression can look like the corresponding NL sentence, or at least like a similar, equivalent one. This allows to write in ERROL very complex queries by simple conversion from their NL specifications. It also allows a straightforward checking of an ERROL expression meeting a complex NL specification. ERROL is also applicable to newer applications like querying the Semantic web using ontologies. Reshaped Relational Algebra (RRA), with operators that follow the semantics of respective major NL constructs, has been developed to support ERROL over relational databases. It is used both to specify ERROL's semantics concisely and accurately, and to implement ERROL effectively over relational databases. (en)
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  • ERROL (an acronym for Entity Relationship Role Oriented Language) is a declarative database query and manipulation language for the Entity-relationship model . It is applicable to any data model on which ERM can be mapped, virtually any general purpose database data model. It is based on the capability of ER diagrams to be described accurately by simple Natural language sentences. A specification of a complex operation upon an ERM database can be described accurately by a complex and/or compound NL sentence constructed from the simple sentences describing the respective ER diagram. An ERROL expression mimics such NL sentence with one-to-one correspondence between ERROL subexpressions and NL subsentences: An ERROL expression can look like the corresponding NL sentence, or at least like a similar, equivalent one. This allows to write in ERROL very complex queries by simple conversion from their NL specifications. It also allows a straightforward checking of an ERROL expression meeting a complex NL specification. (en)
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  • ERROL (en)
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