query isdefined(deleteObject("Document"));
query isdefined(deleteObject("Author"));
query isdefined(deleteObject("Keyword"));
query isdefined(deleteObject("Publisher"));
query isdefined(deleteObject("Conference"));
query isdefined(deleteObject("Collection"));

let Document = DocumentP feed oconsume[Docid];
let Author = AuthorP feed oconsume[Authorid];
let Keyword = KeywordP feed oconsume[Wordid];
let Publisher = PublisherP feed oconsume[Publisherid];
let Conference = ConferenceP feed oconsume[Conferenceid];
let Collection = CollectionP feed oconsume[Collectionid];

query isdefined(deleteObject("AUTHOR_OF"));
query isdefined(deleteObject("AUTHOR_OF_B"));
query isdefined(deleteObject("KEYWORD_OF"));
query isdefined(deleteObject("KEYWORD_OF_B"));
query isdefined(deleteObject("PUBLISHED_BY"));
query isdefined(deleteObject("PUBLISHED_BY_B"));
query isdefined(deleteObject("PUBLISHED_AT"));
query isdefined(deleteObject("PUBLISHED_AT_B"));
query isdefined(deleteObject("PART_OF"));
query isdefined(deleteObject("PART_OF_B"));

let AUTHOR_OF = AUTHOR_OFp feed oconsume[Authorid];
let AUTHOR_OF_B = AUTHOR_OFp feed oconsume[Docid];
let KEYWORD_OF = KEYWORD_OFp feed oconsume[Docid];
let KEYWORD_OF_B = KEYWORD_OFp feed oconsume[Wordid];
let PUBLISHED_BY = PUBLISHED_BYp feed oconsume[Docid];
let PUBLISHED_BY_B = PUBLISHED_BYp feed oconsume[Publisherid];
let PUBLISHED_AT = PUBLISHED_ATp feed oconsume[Docid];
let PUBLISHED_AT_B = PUBLISHED_ATp feed oconsume[Conferenceid];
let PART_OF = PART_OFp feed oconsume[Docid];
let PART_OF_B = PART_OFp feed oconsume[Collectionid];