Object–role modeling: Difference between revisions

Revision as of 01:29, 3 April 2023

Revision as of 01:36, 3 April 2023

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=== Fact-based modeling ===

[[Fact-based modellingmodeling]] includes procedures for mapping facts to attribute-based structures, such as those of ER or UML.<ref name="orm.net"/>

Fact-based textual representations are based on formal subsets of native languages. ORM proponents argue that ORM models are easier to understand by people without a technical education. For example, proponents argue that object–role models are easier to understand than declarative languages such as [[Object Constraint Language]] (OCL) and other graphical languages such as [[Unified Modeling Language|UML]] class models.<ref name="orm.net"/> Fact-based graphical notations are more expressive than those of ER and [[Unified Modeling Language|UML]]. An object–role model can be automatically mapped to relational and deductive databases (such as [[datalog]]).<ref>{{Cite web|url=http://www.ormfoundation.org/files/folders/orm_2010/entry2360.aspx|title=P:11 Mapping ORM To Datalog - an Overview - The ORM Foundation|website=www.ormfoundation.org|access-date=May 31, 2020}}</ref>

=== ORM 2 graphical notation ===

ORM2 is the latest generation of object–role modeling. The main objectives for the ORM 2 graphical notation are:<ref>{{cite web|url=http://www.orm.net/pdf/ORM2.pdf |title=ORM 2 |access-date=April 22, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090219122007/http://orm.net/pdf/ORM2.pdf |archive-date=February 19, 2009 }} Halpin, T. 2005, 'ORM 2', On the Move to Meaningful Internet Systems 2005: OTM 2005 Workshops, eds R. Meersman, Z. Tari, P. Herrero et al., Cyprus. Springer LNCS 3762, pp. 676-87676–87.</ref>

* More compact display of ORM models without compromising clarity

* Improved internationalization (e.g. avoid English language symbols)