<?xml version="1.0"?>
<robot name="gravity_arm">
<link name="base"/>
<link name="link1">
<inertial>
<origin rpy="0 0 0" xyz="0 0.5 0"/>
<mass value="1"/>
<inertia ixx="0.01" ixy="0" ixz="0" iyy="0.01" iyz="0" izz="0.01"/>
</inertial>
</link>
<joint name="joint1" type="revolute">
<parent link="base"/>
<child link="link1"/>
<origin rpy="0 0 0" xyz="0 0 0"/>
<axis xyz="0 0 1"/>
<limit effort="1000" lower="-10" upper="10" velocity="100"/>
</joint>
<link name="link2">
<inertial>
<origin rpy="0 0 0" xyz="0 0.5 0"/>
<mass value="1"/>
<inertia ixx="0.01" ixy="0" ixz="0" iyy="0.01" iyz="0" izz="0.01"/>
</inertial>
</link>
<joint name="joint2" type="revolute">
<parent link="link1"/>
<child link="link2"/>
<origin rpy="1.5707963267948966 0 0" xyz="1 0 0"/>
<axis xyz="0 0 1"/>
<limit effort="1000" lower="-10" upper="10" velocity="100"/>
</joint>
</robot>