<?php

class WP_Export_Oxymel extends Oxymel {
    public function optional( $tag_name, $contents ) {
        if ( $contents ) {
            $this->$tag_name( $contents );
        }
        return $this;
    }

    public function optional_cdata( $tag_name, $contents ) {
        if ( $contents ) {
            $this->$tag_name->contains->cdata( $contents )->end;
        }
        return $this;
    }

    public function cdata( $text ) {
        if ( is_string( $text ) && ! seems_utf8( $text ) ) {
            $text = mb_convert_encoding( $text, 'UTF-8' );
        }
        return parent::cdata( $text );
    }
}