QlikView Reference Manual.pdf - QlikCommunity - QlikView

F Backus-Naur Formalism
The QlikView command line syntax ( Command Line Syntax (page 38)) and Script Syntax (page 219) are
described in a notation called Backus-Naur Formalism, or BNF code. Here follows a short description of the
BNF code used in this manual:
Symbol interpretation
| Logical or: the symbol on either side can be used.
( ) Brackets defining precedence: used for structuring the BNF syntax.
[ ] Square brackets: enclosed items are optional.
{ } Braces: enclosed items may be repeated zero or more times.
symbol A non-terminal syntactic category: can be divided further into other symbols, e.g. compounds
of the above, other non-terminal symbols, text strings, etc.
::= Marks the beginning of a block that defines a symbol.
load A terminal symbol consisting of a text string. Should be written as it is into the script.
Non-terminal symbols are indicated by italic type and all terminal symbols are printed in a bold face font.
E.g. "(" should be interpreted as a bracket defining precedence, whereas "(" should be interpreted as a character
that should be printed in the script.
Example:
The description of the alias statement is:
aliasfieldnameasaliasname { , fieldname as aliasname }
This should be interpreted as the text string alias, followed by an arbitrary field name, followed by the text
string as, followed by an arbitrary alias name. Any number of additional combinations of fieldnameasaliasname
may be given, separated by commas.
E.g. the following statements are correct:
alias a as first;
alias a as first, b as second;
alias a as first, b as second, c as third;
And the following statements are not correct:
alias a as first b as second;
alias a as first {, b as second};
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