operator identifier for Siena
Siena defines some of the most common operators (or
binary relations). SienaOperator
is the type of
operator identifiers.
Siena_sf
Siena_sf
y is true if y is a
suffix of x. For example, "software" Siena_sf "ware" ==
true
, while "software" Siena_sf "w" ==
false
. Siena_sf
is defined for strings
only.
Siena_pf
Siena_pf
y is true if y is
a prefix of x. For example, "software" Siena_pf
"soft" == true
, while "software" Siena_pf "of"
== false
. Siena_pf
is defined for strings
only.
Siena_lt
false
< true
.
Siena_gt
Siena_le
Siena_ge
Siena_xx
true
.
Siena_ne
Siena_ss
Siena_ss
y is true if y is
a substring of x. For example, "software"
Siena_ss "war" == true
, while "software"
Siena_ss "hard" == false
. Siena_ss
is
defined for strings only.
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