X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrdgraph_data.pod;h=dba53f3720a4a302b2cc8651545eed3a993bbd89;hb=9b8a8e557d4c271ad4efe95c4b7bb7f0803e729c;hp=975c385d783733acf906d4d4b2e15f21165b390d;hpb=4b7345f9345915c8061e4b37b26ce8887828c973;p=rrdtool.git

diff --git a/doc/rrdgraph_data.pod b/doc/rrdgraph_data.pod
index 975c385..dba53f3 100644
--- a/doc/rrdgraph_data.pod
+++ b/doc/rrdgraph_data.pod
@@ -19,6 +19,9 @@ useful information such as maximum, minimum etcetera. Two of the
 instructions use a language called B<RPN> which is described in its
 own manual page.
 
+Variable names (I<vname>) must be made up strings of the following characters
+C<A-Z, a-z, 0-9, -,_>, starting with a letter and a maximum length of 255 characters.
+
 =head1 DEF
 
 B<DEF:>I<E<lt>vnameE<gt>>=I<E<lt>rrdfileE<gt>>:I<E<lt>ds-nameE<gt>>:I<E<lt>CFE<gt>>[:step=I<E<lt>stepE<gt>>][:start=I<E<lt>timeE<gt>>][:end=I<E<lt>timeE<gt>>][:reduce=I<E<lt>B<CF>E<gt>>]
@@ -27,7 +30,7 @@ This command fetches data from an B<RRD> file.  The virtual name
 I<vname> can then be used throughout the rest of the script. By
 default, an B<RRA> which contains the correct consolidated data
 at an appropriate resolution will be chosen.  The resolution can
-be overridden with the L<--step|rrdgraph/item_Time> option. 
+be overridden with the L<--step|rrdgraph/item_Time> option.
 The resolution can again be overridden by specifying the B<step size>.
 The time span of this data is the same as for the graph by default,
 you can override this by specifying B<start and end>.  Remember to
@@ -41,8 +44,6 @@ from an B<RRA>.  For instance, if your B<RRD> has an B<RRA> with
 a resolution of 1800 seconds per B<CDP>, you should create an
 image with width 400 and time span 400*1800 seconds (use appropriate
 start and end times, such as C<--start end-8days8hours>).
-=for comment
-XXX is the above start/end syntax correct? Fritz
 
 If consolidation needs to be done, the B<CF> of the B<RRA> specified in the
 B<DEF> itself will be used to reduce the data density. This behaviour can