+ <listitem><para>the parametrized address of the tile, in the spirit of C printf format, with 3 "%d" fields for Z, X and Y (in that order) (eg. "/%d/%d/%d.png")</para></listitem>
+ </varlistentry>
+ <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>lat-min (optional)</term>
+ <listitem><para>The minimum latitude value in degrees supported by the tile server. The Default is -90 degrees if not specified.</para></listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>lat-max (optional)</term>
+ <listitem><para>The maximum latitude value in degrees supported by the tile server. The Default is 90 degrees if not specified.</para></listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>lon-min (optional)</term>
+ <listitem><para>The minimum longitude value in degrees supported by the tile server. The Default is -180 degrees if not specified.</para></listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>lon-max (optional)</term>
+ <listitem><para>The maximum longitude value in degrees supported by the tile server. The Default is 180 degrees if not specified.</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>
+ <varlistentry>
+ <term>use-direct-file-access (optional)</term>
+ <listitem>
+ <para>Only use files on disk. The default is <emphasis>FALSE</emphasis></para>
+ <para>This can also be useful for tilesets already on disk as it will avoid attempting to download any tiles.</para>
+ <para>Thus with this type the <emphasis>hostname</emphasis> and <emphasis>url</emphasis> parameters are not necessary and are ignored.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>switch-xy (optional)</term>
+ <listitem>
+ <para>Swap the X,Y values around in the URL parametrized ordering.</para>
+ <para>The default is false.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>check-file-server-time (optional)</term>
+ <listitem>
+ <para>Sends the timestamp of the tile to the server, so the server can decide whether it should send a new tile or not.</para>
+ <para>The default is false.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>use-etag (optional)</term>
+ <listitem>
+ <para>Use and compare the <ulink url="http://en.wikipedia.org/wiki/HTTP_ETag">ETag</ulink> value in determining whether to download a newer tile. The default is false.</para>
+ <para>The ETag value is stored in a separate file in the same directory as the tile to enable checking the value across multiple runs of the program.</para>
+ </listitem>