Register a fully custom XML namespace handler from an add-on

Free Advanced Since v1.0.0

Implement FeedNamespaceInterface and append your instance inside a benecaster_feed_namespaces callback. The registry handles xmlns injection, channel-level merging, and per-episode merging automatically — no FeedCompiler changes needed. Required methods: get_xmlns(): array, channel_tags( int $show_id ): array, and episode_tags( int $episode_id, int $show_id ): array.

Code

<?php
// In your add-on's boot class:
add_filter( 'benecaster_feed_namespaces', function ( array $handlers ): array {
    $handlers[] = new \MyAddon\MyCustomNamespace();
    return $handlers;
} );

// MyCustomNamespace implements FeedNamespaceInterface:
class MyCustomNamespace implements \Benecaster\Feed\Namespaces\FeedNamespaceInterface {
    public function get_xmlns(): array {
        return [ 'mycustom' => 'https://myaddon.example.com/ns/1.0' ];
    }

    public function channel_tags( int $show_id ): array {
        $value = get_post_meta( $show_id, '_my_addon_channel_tag', true );
        return $value ? [ '<mycustom:channel-tag>' . esc_xml( $value ) . '</mycustom:channel-tag>' . "\n" ] : [];
    }

    public function episode_tags( int $episode_id, int $show_id ): array {
        $value = get_post_meta( $episode_id, '_my_addon_episode_tag', true );
        return $value ? [ '<mycustom:episode-tag>' . esc_xml( $value ) . '</mycustom:episode-tag>' . "\n" ] : [];
    }
}

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Hooks Used

benecaster_feed_namespaces