procedure
<group>.customize() { <data_block> }
A function to add user defined elements to a group structure.
<data_block>
is a block of statements, each of the form:
<type> {<element>{[<num>]} {= <values>} }
where:
<type> - The identifier type.
<element> - The element name, unique for the structure.
[<num>] - The array dimension if the element is an arraynum may be omitted from variable-length arrays.
<values> - Initial value(s) for the element.
<element> can be omitted when <type> is another class of structure. In such cases the members of <type> are inherited by the new structure and given the same element names. If <type> is a filter, its value must be a single line definition.
The new structure elements cannot be graphic elements.
group mygroup mygroup.customize { string info = 'Roads' }
This function cannot be changed by the user.
When groups are saved in atable files, any customization is lost.