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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 20 | xmlns:sy="http://purl.org/rss/1.0/modules/syndication/" |
| 21 | xmlns:admin="http://webns.net/mvcb/" |
| 22 | xmlns:content="http://purl.org/rss/1.0/modules/content/" |
| 23 | <?php |
| 24 | /** |
| 25 | * Fires at the end of the feed root to add namespaces. |
| 26 | * |
| 27 | * @since 2.0.0 |
| 28 | */ |
| 29 | do_action( 'rdf_ns' ); |
| 30 | ?> |
| 31 | > |
| 32 | <channel rdf:about="<?php bloginfo_rss( 'url' ); ?>"> |
| 33 | <title><?php wp_title_rss(); ?></title> |
| 34 | <link><?php bloginfo_rss( 'url' ); ?></link> |
| 35 | <description><?php bloginfo_rss( 'description' ); ?></description> |
| 36 | <dc:date><?php echo get_feed_build_date( 'Y-m-d\TH:i:s\Z' ); ?> </dc:date> |
| 37 | <sy:updatePeriod> |
| 38 | <?php |