From a5f9bb1eb952a5ca329e770e7d19d05672e90193 Mon Sep 17 00:00:00 2001
From: Christophe Geuzaine <cgeuzaine@ulg.ac.be>
Date: Fri, 31 Jan 2014 17:36:26 +0000
Subject: [PATCH] clarify docs: identification numbers should be strictly
positive
---
doc/texinfo/gmsh.texi | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/doc/texinfo/gmsh.texi b/doc/texinfo/gmsh.texi
index 5688021160..6f81b129fe 100644
--- a/doc/texinfo/gmsh.texi
+++ b/doc/texinfo/gmsh.texi
@@ -1791,8 +1791,9 @@ Surface} or @code{Ruled Surface} commands, or by extruding lines), and
finally volumes (using the @code{Volume} command or by extruding
surfaces).
-These geometrical entities are called ``elementary'' in Gmsh's jargon, and
-are assigned identification numbers when they are created:
+These geometrical entities are called ``elementary'' in Gmsh's jargon,
+and are assigned identification numbers (stricly positive) when they are
+created:
@enumerate
@item each elementary point must possess a unique identification number;
@@ -1805,7 +1806,8 @@ are assigned identification numbers when they are created:
ways, for example using the @code{Translate}, @code{Rotate},
@code{Scale} or @code{Symmetry} commands. They can be deleted with the
@code{Delete} command, provided that no higher-dimension entity
-references them.
+references them. Zero or negative identification numbers are reserved by
+the system for special uses: do not use them in your scripts.
Groups of elementary geometrical entities can also be defined and
are called ``physical'' entities. These physical entities cannot be modified
--
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