+ <varlistentry>
+ <term>zoom-min (optional)</term>
+ <listitem><para>The minimum zoom value supported by the tile server. The Default is 0 if not specified.</para></listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>zoom-max (optional)</term>
+ <listitem>
+ <para>The maximum zoom value supported by the tile server. The Default is 18 if not specified.</para>
+ <para>See <ulink url="http://wiki.openstreetmap.org/wiki/Zoom_levels">Zoom Levels</ulink></para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>file-extension (optional)</term>
+ <listitem>
+ <para>The file extension of the files on disk. The default is <emphasis>.png</emphasis></para>
+ <para>If the tile source URL ends in something other than .png, then this parameter will need to match it.</para>
+ <para>This can also be useful in reading a tileset from other software which may name tiles in an alternative form,
+ e.g. for Mobile Atlas creator it names them <emphasis>.png.tile</emphasis></para>
+ <note><para>The file types actually usable are those supported by GDK Pixbuf Library, which includes at least PNG and JPEG.</para></note>
+ <note><para>Remember to include the beginning <emphasis>'.'</emphasis> when specifying this parameter.</para></note>
+ </listitem>
+ </varlistentry>