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ERIL
ERIL (Entity-Relationship and Inheritance Language) is a visual language for representing the data structure of a computer system. As its name suggests, ERIL is based on entity-relationship diagrams and class diagrams. ERIL combines the relational and object-oriented approaches to data modeling. Overview ERIL can be seen as a set of guidelines aimed at improving the readability of structure diagrams. These guidelines were borrowed from DRAKON, a variant of flowcharts created within the Russian space program. ERIL itself was developed by Stepan Mitkin. The ERIL guidelines for drawing diagrams: * Lines must be straight, either strictly vertical or horizontal. * Vertical lines mean ownership (composition). * Horizontal lines mean peer relationships ( aggregation). * Line intersections are not allowed. * It is not recommended to fit the whole data model on a single diagram. Draw many simple diagrams instead. * The same class (table) can appear several times on the same diagram. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DRAKON
DRAKON () is a Free and open-source software, free and open source algorithmic visual programming language, visual programming and modeling language developed as part of the defunct Soviet Union Buran program, Buran space program in 1986 following the need in increase of software development productivity. The visual language provides a uniform way to represent processes in flowcharts. There are various implementation of the language specification that may be used to draw and export actual flowcharts. Notable examples include free and open source DRAKON Editor (September 2011). History The development of DRAKON started in 1986 to address the emerging risk of misunderstandings - and subsequent errors - between users of different programming languages in the Russian space program. Its development was directed by Vladimir Parondzhanov with the participation of the Russian Federal Space Agency (Academician Pilyugin Center, Moscow) and Russian Academy of Sciences (Keldysh Ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Simple Example ERIL Diagram
A, or a, is the first Letter (alphabet), letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is ''English alphabet#Letter names, a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version is often written in one of two forms: the double-storey and single-storey . The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, ''English articles, a'' is the indefinite article, with the alternative form ''an''. Name In English, the name of the letter is the ''long A'' sound, pronounced . Its name in most other languages matches the letter's pronunciation in open syllables. History The earliest know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
