===================================================================
RCS file: /cvs/mandoc/eqn.7,v
retrieving revision 1.12
retrieving revision 1.18
diff -u -p -r1.12 -r1.18
--- mandoc/eqn.7	2011/07/21 15:21:13	1.12
+++ mandoc/eqn.7	2011/07/22 14:59:02	1.18
@@ -1,4 +1,4 @@
-.\"	$Id: eqn.7,v 1.12 2011/07/21 15:21:13 kristaps Exp $
+.\"	$Id: eqn.7,v 1.18 2011/07/22 14:59:02 kristaps Exp $
 .\"
 .\" Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: July 21 2011 $
+.Dd $Mdocdate: July 22 2011 $
 .Dt EQN 7
 .Os
 .Sh NAME
@@ -59,35 +59,31 @@ these are not the same as
 macros, and may only be invoked as
 .Sq \&.EQ .
 .Pp
-The equation grammar is as follows:
+The equation grammar is as follows, where quoted strings are
+case-sensitive literals in the input:
 .Bd -literal -offset indent
 eqn     : box | eqn box
 box     : text
-        | { eqn }
-        | DEFINE text text
-        | SET text text
-        | UNDEF text
+        | "{" eqn "}"
+        | "define" text text
+        | "gfont" text
+        | "gsize" text
+        | "set" text text
+        | "undef" text
         | box pos box
         | box mark
+        | pile "{" list "}"
         | font box
-        | SIZE text box
+        | "size" text box
+        | "left" text eqn ["right" text]
 text    : TEXT
-pos     : OVER
-        | SUP
-        | SUB
-        | TO
-        | FROM
-mark	: DOT
-        | DOTDOT
-        | HAT
-        | TILDE
-        | VEC
-        | DYAD
-        | BAR
-        | UNDER
-font    : ROMAN
-        | ITALIC
-        | BOLD
+pile    : "lpile" | "cpile" | "rpile"
+pos     : "over" | "sup" | "sub" | "to" | "from"
+mark	: "dot" | "dotdot" | "hat" | "tilde" | "vec"
+        | "dyad" | "bar" | "under"
+font    : "roman" | "italic" | "bold"
+list    : eqn 
+        | list "above" eqn
 .Ed
 .Pp
 Data in TEXT form is a non-empty sequence of non-space characters or a
@@ -96,6 +92,19 @@ Unless within a quoted string, white-space (and enclos
 pairs) is thrown away.
 Quoted strings are not scanned for replacement definitions.
 .Pp
+The following TEXT terms are translated into a rendered glyph, if
+available: alpha, beta, chi, delta, epsilon, eta, gamma, iota, kappa,
+lambda, mu, nu, omega, omicron, phi, pi, psi, rho, sigma, tau, theta,
+upsilon, xi, zeta, DELTA, GAMMA, LAMBDA, OMEGA, PHI, PI, PSI, SIGMA,
+THETA, UPSILON, XI, inter (intersection), union (union), prod (product),
+int (integral), sum (summation), grad (gradient), del (vector
+differential), times (multiply), cdot (centre-dot), nothing (zero-width
+space), approx (approximately equals), prime (prime), half (one-half),
+partial (partial differential), inf (infinity), >> (much greater), <<
+(much less), \-> (left arrow), <\- (right arrow), += (plus-minus), !=
+(not equal), == (equivalence), <= (less-than-equal), and >=
+(more-than-equal).
+.Pp
 The following control statements are available:
 .Bl -tag -width Ds
 .It Cm define
@@ -134,9 +143,25 @@ foo bar 'baz'
 .Ed
 .Pp
 Self-referencing definitions will raise an error.
+.It Cm gfont
+Set the default font of subsequent output.
+Its syntax is as follows:
+.Pp
+.D1 gfont Ar font
+.Pp
+In mandoc, this value is discarded.
+.It Cm gsize
+Set the default size of subsequent output.
+Its syntax is as follows:
+.Pp
+.D1 gsize Ar size
+.Pp
+The
+.Ar size
+value should be an integer.
 .It Cm set
 Set an equation mode.
-Both arguments are thrown away.
+In mandoc, both arguments are thrown away.
 Its syntax is as follows:
 .Pp
 .D1 set Ar key val
@@ -201,7 +226,7 @@ In mandoc, this is interpreted as a comment.
 .%D 1978
 .Re
 .Sh HISTORY
-The eqn utility, a preprocessor for troff, was originally written by 
+The eqn utility, a preprocessor for troff, was originally written by
 Brian W. Kernighan and Lorinda L. Cherry in 1975.
 The GNU reimplementation of eqn, part of the GNU troff package, was
 released in 1989 by James Clark.