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### 5.1 Coding data section

The data section is a sequence of data blocks in various formats, which are discussed in following subsections. The order, in which data blocks follow in the data section, may be arbitrary, not necessarily the same as in which the corresponding model objects follow in the model section.

The rules of coding the data section are commonly the same as the rules of coding the model description (for details see Section “Coding model description”), i.e. data blocks are composed from basic lexical units such as symbolic names, numeric and string literals, keywords, delimiters, and comments. However, for the sake of convenience and improving readability there is one deviation from the common rule: if a string literal consists of only alphanumeric characters (including the underscore character), the signs + and -, and/or the decimal point, it may be coded without bordering (single or double) quotes.

All numeric and symbolic material provided in the data section is coded in the form of numbers and symbols, i.e. unlike the model section no expressions are allowed in the data section. Nevertheless the signs + and - can precede numeric literals to allow coding signed numeric quantities, in which case there must be no white-space characters between the sign and following numeric literal (if there is at least one white-space, the sign and following numeric literal are recognized as two different lexical units).