The <function> tag is used to define both
normal and aggregate functions. Name, type and returned data
type have to be specified using attributes.
- • name - function name
- • type - either normal (default) or aggregate
- • null - true if function may return NULL, else false (default)
- • returns - return type: string, int, real or datetime
- • length - for real and integer
- • decimals - for real
Function parameters are defined using the <parameter> tag.
Data private to a function is declared within the <data> tag.
The <code> tag takes the code for normal functions,
aggregate function code is put into the <clear>,
<add> and <result> tags
