+ <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>