SimplePie_Source::get_longitude
SimplePie_Source::get_latitude
SimplePie_Source::get_language
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SimplePie_Source::get_description
SimplePie_Source::get_copyright
SimplePie_Source::get_links
SimplePie_Source::get_link
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SimplePie_Source::get_permalink
Added for parity between the parent-level and the item/entry-level.