context dependent grammars - ορισμός. Τι είναι το context dependent grammars
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Τι (ποιος) είναι context dependent grammars - ορισμός

MEANS OF EXPRESSING GRAMMATICAL RELATIONSHIPS
Definite clause grammars; Context-sensitive definite clause grammars

Context-free grammar         
  • C programming language]] (left), and a derivation of a piece of C code (right) from the nonterminal symbol <math>\langle\text{Stmt}\rangle</math>. Nonterminal symbols are blue and terminal symbols are red.
  • An example parse tree
  • Two different parse trees from the same input
  • 1 + 1 + a}}
  • 1 + 1 + a}}
TYPE OF FORMAL GRAMMAR
Context free grammars; Context free grammar; Context-free grammars; Useless rules; Useless Rules; Proper grammar; Context-free Grammar; Content free grammar; Context free gramar; Rightmost derivation; Leftmost derivation; Left-sentential; Left sentential; Right-sentential; Right sentential; Context Free Grammar; Unreachable symbol; Unproductive symbol; Nonterminal nullability; Ε-production
In formal language theory, a context-free grammar (CFG) is a formal grammar whose production rules are of the form
Context-sensitive grammar         
FORMAL GRAMMAR IN WHICH COMPONENTS OF PRODUCTION RULES MAY BE SURROUNDED BY A CONTEXTUAL SYMBOLS
Context sensitive grammar; Context-dependent grammar
A context-sensitive grammar (CSG) is a formal grammar in which the left-hand sides and right-hand sides of any production rules may be surrounded by a context of terminal and nonterminal symbols. Context-sensitive grammars are more general than context-free grammars, in the sense that there are languages that can be described by CSG but not by context-free grammars.
Dependent source         
VOLTAGE SOURCE OR A CURRENT SOURCE WHOSE VALUE DEPENDS ON A VOLTAGE OR CURRENT SOMEWHERE ELSE IN THE NETWORK
Dependent sources; Dependent Sources; Dependent generator
In the theory of electrical networks, a dependent source is a voltage source or a current source whose value depends on a voltage or current elsewhere in the network.I.

Βικιπαίδεια

Definite clause grammar

A definite clause grammar (DCG) is a way of expressing grammar, either for natural or formal languages, in a logic programming language such as Prolog. It is closely related to the concept of attribute grammars / affix grammars from which Prolog was originally developed. DCGs are usually associated with Prolog, but similar languages such as Mercury also include DCGs. They are called definite clause grammars because they represent a grammar as a set of definite clauses in first-order logic.

The term DCG refers to the specific type of expression in Prolog and other similar languages; not all ways of expressing grammars using definite clauses are considered DCGs. However, all of the capabilities or properties of DCGs will be the same for any grammar that is represented with definite clauses in essentially the same way as in Prolog.

The definite clauses of a DCG can be considered a set of axioms where the validity of a sentence, and the fact that it has a certain parse tree can be considered theorems that follow from these axioms. This has the advantage of making it so that recognition and parsing of expressions in a language becomes a general matter of proving statements, such as statements in a logic programming language.