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+.TH LIBNORMALFORM_EVALUATE 3 LIBNORMALFORM
+.SH NAME
+libnormalform_evaluate \- Determine value of a formula
+
+.SH SYNOPSIS
+.nf
+#include <libnormalform.h>
+
+int libnormalform_evaluate(LIBNORMALFORM_SENTENCE *\fIformula\fP);
+.fi
+.PP
+Link with
+.IR -lnormalform .
+
+.SH DESCRIPTION
+The
+.BR libnormalform_evaluate ()
+function determines the value of
+.IR formula .
+.PP
+Before calling the
+.BR libnormalform_evaluate ()
+function, the application must configure application
+defined parts of the formula. That is, any
+.IR "struct libnormalform_variable" ,
+.IR "struct libnormalform_function" ,
+.IR "struct libnormalform_map" ,
+and
+.IR "struct libnormalform_transformer"
+must be set configuared accord to the specifications
+specified for the function it was used in.
+
+.SH RETURN VALUE
+Upon successful completion, the
+.BR libnormalform_evaluate ()
+function returns 1 if the
+.I formula
+is true for configured input, 0 if the
+.I formula
+is false for configured input;
+otherwise, the function returns
+.IR -1 .
+
+.SH ERRORS
+The
+.BR libnormalform_evaluate ()
+function fails if an application function fails.
+The
+.BR libnormalform_evaluate ()
+function does not modify
+.IR errno ,
+but lets application functions modify
+.IR errno .
+
+.SH ATTRIBUTES
+For an explanation of the terms used in this
+section, see
+.BR attributes (7)
+and
+.IR "info \(dq(libc)POSIX Safety Concepts\(dq" .
+.TS
+allbox;
+lb lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.BR libnormalform_evaluate ()
+T}	Thread safety	MT-Safe race:\fIsentence\fP
+T{
+.BR libnormalform_evaluate ()
+T}	Async-signal safety	AS-Unsafe heap
+T{
+.BR libnormalform_evaluate ()
+T}	Async-cancel safety	AC-Safe mem, AC-Unsafe heap
+.TE
+
+.SH SEE ALSO
+.BR libnormalform (7)