Context-free grammar is a formal model used to describe the syntax of a language. It consists of a set of production rules that define how symbols can be combined to form valid sentences in the language.
To build logic for a context-free grammar, you will need to define a set of non-terminal symbols, terminal symbols, and production rules. These rules should follow the format of "non-terminal symbol -> combination of terminal and non-terminal symbols". Additionally, you will need to define a start symbol to indicate the beginning of a sentence.
The start symbol is used to indicate the beginning of a sentence in a context-free grammar. It is typically the first symbol in a production rule and is used to generate all possible sentences in the language.
To ensure that your context-free grammar is unambiguous, you will need to make sure that each production rule has only one possible interpretation. This can be achieved by carefully defining the rules and avoiding ambiguity in the use of symbols.
Yes, context-free grammar can be used for natural language processing. However, it is often combined with other techniques, such as semantic analysis, to handle the complexities of natural language. Additionally, a large and comprehensive grammar is needed to accurately represent the syntax of a natural language.