Structure of the neutral file language

The structure of the neutral file language is formal described by a context-free grammar G(N,T,P,Z), where N denotes the set of the non-terminal characters and T the set of the terminal characters. The start character Z is defined as follows  

The complete syntax definition of the neutral file in BNF notation is given by the productions defined below and those which have been documented 

This chapter defines the neutral file semantics by defining the effect of each statement on the file in terms of the changes which will result in the post-processor data structure. This technique is borrowed from the GKS standard. The post-processor data structure consists of a number of state lists defined more precisely in 9. State lists on page 181. 

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The file structure specification is split into two parts The overall file syntax is defined in "Structure of the neutral file language" on page 168, while the detailed syntax of all the entity and property records is given together with the data structure specification in " 5. The CAD I reference model specification" on page 43 starting with the as the target symbol. 

The structure of the neutral file language (syntax) is defined in Backus-Naur form. 

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