sysdbql(7): Document IS [NOT] TRUE / FALSE.

diff --git a/doc/sysdbql.7.txt b/doc/sysdbql.7.txt
index 9a16e23a4593f58f7ca582728e4828b6d68205aa..de7c7c472b754a442ee264870d83788a3eeee103 100644 (file)
--- a/doc/sysdbql.7.txt
+++ b/doc/sysdbql.7.txt
@@ -129,6 +129,13 @@ Boolean expressions may use the following operators:
        expression evaluates to NULL if the queried object does not exist (e.g.,
        when accessing an attribute value).
 
        expression evaluates to NULL if the queried object does not exist (e.g.,
        when accessing an attribute value).
 

+'<expression>' *IS TRUE*::
+'<expression>' *IS NOT TRUE*::
+'<expression>' *IS FALSE*::
+'<expression>' *IS NOT FALSE*::
+       Check whether an expression evaluates to a boolean *true* or *false* value
+       (or not).
+

 '<expression>' *IN* '<expression>'::
 '<expression>' *NOT IN* '<expression>'::
        Checks whether the value of the first expression is included in the value
 '<expression>' *IN* '<expression>'::
 '<expression>' *NOT IN* '<expression>'::
        Checks whether the value of the first expression is included in the value