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* returns a list of item metadata not covered by this class.
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* The returned map contains key value pairs, where the key
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* is the tag name of the element, namespace prefix are resolved
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* to the corresponding URIs. The value is the XML element as read
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* For example, to access the <itunes:keywords> element, use
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* additionalProperties()["http://www.itunes.com/dtds/podcast-1.0.dtdkeywords"].
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virtual QMultiMap<QString, QDomElement> additionalProperties() const = 0;
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* returns a description of the item for debugging purposes