<element name="world" required="*">
<description>The world element encapsulates an entire world description including: models, scene, physics, and plugins.</description>
<attribute name="name" type="string" default="__default__" required="1">
<description>Unique name of the world</description>
</attribute>
<element name="audio" required="0">
<description>Global audio properties.</description>
<element name="device" type="string" default="default" required="1">
<description>Device to use for audio playback. A value of "default" will use the system's default audio device. Otherwise, specify a an audio device file"</description>
</element>
</element>
<element name="wind" required="0">
<description>The wind tag specifies the type and properties of the wind.</description>
<element name="linear_velocity" type="vector3" default="0 0 0" required="0">
<description>Linear velocity of the wind.</description>
</element>
</element>
<element name="include" required="*">
<description>
Include resources from a URI. Included resources can only contain one 'model', 'light' or 'actor' element. The URI can point to a directory or a file. If the URI is a directory, it must conform to the model database structure (see /tutorials?tut=composition&cat=specification&#defining-models-in-separate-files).
</description>
<element name="uri" type="string" default="__default__" required="1">
<description>URI to a resource, such as a model</description>
</element>
<element name="name" type="string" default="" required="0">
<description>Override the name of the included entity.</description>
</element>
<element name="static" type="bool" default="false" required="0">
<description>Override the static value of the included entity.</description>
</element>
<include filename="pose.sdf" required="0"/>
<include filename="plugin.sdf" required="*"/>
<element name="placement_frame" type="string" default="" required="0">
<description>The frame inside the included entity whose pose will be set by the specified pose element. If this element is specified, the pose must be specified.</description>
</element>
</element>
<element name="gravity" type="vector3" default="0 0 -9.8" required="1">
<description>The gravity vector in m/s^2, expressed in a coordinate frame defined by the spherical_coordinates tag.</description>
</element> <!-- End Gravity -->
<element name="magnetic_field" type="vector3" default="5.5645e-6 22.8758e-6 -42.3884e-6" required="1">
<description>The magnetic vector in Tesla, expressed in a coordinate frame defined by the spherical_coordinates tag.</description>
</element> <!-- End Magnetic -->
<include filename="atmosphere.sdf" required="1"/>
<include filename="gui.sdf" required="0"/>
<include filename="physics.sdf" required="+"/>
<include filename="scene.sdf" required="1"/>
<include filename="light.sdf" required="*"/>
<include filename="frame.sdf" required="*"/>
<include filename="model.sdf" required="*"/>
<include filename="actor.sdf" required="*"/>
<include filename="plugin.sdf" required="*"/>
<include filename="road.sdf" required="*"/>
<include filename="spherical_coordinates.sdf" required="0"/>
<include filename="state.sdf" required="*"/>
<include filename="population.sdf" required="*"/>
</element> <!-- End World -->