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).