getProp method
Implementation
@override
dynamic getProp(String key){
if (key == 'blobURL') return blobURL;
else if (key == 'id') return id;
else if (key == 'mediaType') return mediaType;
else if (key == 'miniatura') return miniatura;
else if (key == 'payload') return payload;
else if (key == 'xDocID') return xDocID;
else if (key == 'xDocID_resolved') return xDocID_resolved;
else if (key == 'xDocType') return xDocType;
}