Bilbao Crystallographic Server XML output Generators and general positions

Generators/General Positions

To obtain the information about the generators or the general positions of a group in XML form you have to give the command
GET /cgi-bin/cryst/xml/nph-get_doc?p=[genpos|gener]&g=group"
where

• genpos is used to tobtain the general positions and gener -- the generators, and
• group -- is the group number in ITA, followed by a letter that specifies the setting that is used in case that there are two conventional settings.
  The letters are: b|c for the unique axis, o|t where o corresponds to origin choice one and t -- to origin choice two, and [rh]=h|r for rhombohedral and hexagonal axes.

For example if you want to obtain the generators of the group 012( C 2/m) [unique axis c] you have to send the following request to the server:

GET /cgi-bin/cryst/xml/nph-get_doc?p=gener&g=12c

The output you will obtain has the following form:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE bcs_group PUBLIC "bcs_group" "www.cryst.ehu.es/cryst/dtd/bcs_group.dtd">

<bcs_group><!-- Bilbao Crystallographic Server (www.cryst.ehu.es) -->
<group number="12" symbol=" C 2/m">
<generators><!-- Generators of the group 12 ( C 2/m) [unique axis c] -->
<genpos>
<xyz>x,y,z</xyz>
<mat>
<row>[   1   0   0 ] [    0]</row>
<row>[   0   1   0 ] [    0]</row>
<row>[   0   0   1 ] [    0]</row>
</mat>
</genpos>
<genpos>
<xyz>-x,-y,z</xyz>
<mat>
<row>[  -1   0   0 ] [    0]</row>
<row>[   0  -1   0 ] [    0]</row>
<row>[   0   0   1 ] [    0]</row>
</mat>
</genpos>
<genpos>
<xyz>-x,-y,-z</xyz>
<mat>
<row>[  -1   0   0 ] [    0]</row>
<row>[   0  -1   0 ] [    0]</row>
<row>[   0   0  -1 ] [    0]</row>
</mat>
</genpos>
<genpos>
<xyz>x,y+1/2,z+1/2</xyz>
<mat>
<row>[   1   0   0 ] [    0]</row>
<row>[   0   1   0 ] [  1/2]</row>
<row>[   0   0   1 ] [  1/2]</row>
</mat>
</genpos><!-- end of the list -->
</generators>
</group>
</bcs_group>