Advanced sitemaps

We can see the following error message when cache is cleared:

Fatal error: Cannot redeclare class tx_advancedsitemaps_tca in typo3conf/ext/advanced_sitemaps/tca.php on line 316

This happens due to the declaration of the class tx_advancedsitemaps_tca within the TCA.php file.

Instead we must declare the class in a separate file and include this file as follows:

require_once ($_EXTKEY.'class.tx_advancedsitemaps_tca.php');

This will make sure that the file gets included only once, and thus avoiding the error message/warnings.