{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T16:30:49Z","timestamp":1778171449870,"version":"3.51.4"},"publisher-location":"New York, NY, USA","reference-count":34,"publisher":"ACM","license":[{"start":{"date-parts":[[2009,3,23]],"date-time":"2009-03-23T00:00:00Z","timestamp":1237766400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.acm.org\/publications\/policies\/copyright_policy#Background"}],"funder":[{"DOI":"10.13039\/100000145","name":"Division of Information and Intelligent Systems","doi-asserted-by":"publisher","award":["IIS-044797205137780629846"],"award-info":[{"award-number":["IIS-044797205137780629846"]}],"id":[{"id":"10.13039\/100000145","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2009,3,23]]},"DOI":"10.1145\/1514894.1514930","type":"proceedings-article","created":{"date-parts":[[2009,4,6]],"date-time":"2009-04-06T16:34:53Z","timestamp":1239035693000},"page":"296-309","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":36,"title":["Containment of conjunctive queries on annotated relations"],"prefix":"10.1145","author":[{"given":"Todd J.","family":"Green","sequence":"first","affiliation":[{"name":"University of Pennsylvania, Philadelphia, PA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2009,3,23]]},"reference":[{"key":"e_1_3_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/1247480.1247559"},{"key":"e_1_3_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.5555\/993462"},{"key":"e_1_3_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1376916.1376918"},{"key":"e_1_3_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.5555\/645504.656274"},{"key":"e_1_3_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1145\/543613.543633"},{"key":"e_1_3_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1145\/800105.803397"},{"key":"e_1_3_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1145\/137097.137109"},{"key":"e_1_3_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1145\/153850.153856"},{"key":"e_1_3_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1145\/1058150.1058170"},{"key":"e_1_3_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1145\/1142351.1142362"},{"key":"e_1_3_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1145\/303976.303992"},{"key":"e_1_3_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1145\/1055686.1055691"},{"key":"e_1_3_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1145\/357775.357777"},{"key":"e_1_3_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1145\/1376916.1376954"},{"key":"e_1_3_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1145\/239041.239045"},{"key":"e_1_3_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.5555\/645502.656105"},{"key":"e_1_3_2_1_17_1","doi-asserted-by":"publisher","DOI":"10.1145\/1514894.1514920"},{"key":"e_1_3_2_1_18_1","volume-title":"VLDB","author":"Green T. J.","year":"2007"},{"key":"e_1_3_2_1_19_1","doi-asserted-by":"publisher","DOI":"10.1145\/1265530.1265535"},{"key":"e_1_3_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/11896548_24"},{"key":"e_1_3_2_1_21_1","volume-title":"Oxford University Press","author":"Hell P.","year":"2004"},{"key":"e_1_3_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1145\/1634.1886"},{"key":"e_1_3_2_1_23_1","doi-asserted-by":"publisher","DOI":"10.1145\/211414.211419"},{"key":"e_1_3_2_1_24_1","doi-asserted-by":"publisher","DOI":"10.1145\/1142351.1142363"},{"key":"e_1_3_2_1_25_1","volume-title":"Birkh\u00e4user Verlag","author":"K\u00f6bler J.","year":"1993"},{"key":"e_1_3_2_1_26_1","doi-asserted-by":"publisher","DOI":"10.1109\/69.940732"},{"key":"e_1_3_2_1_27_1","article-title":"Operations with structures","author":"Lov\u00e1sz L.","year":"1967","journal-title":"Acta Mathematica Hungarica, 18(3--4):321--328"},{"key":"e_1_3_2_1_28_1","doi-asserted-by":"publisher","DOI":"10.1145\/275487.275512"},{"key":"e_1_3_2_1_29_1","doi-asserted-by":"publisher","DOI":"10.1145\/322217.322221"},{"key":"e_1_3_2_1_30_1","doi-asserted-by":"publisher","DOI":"10.1109\/ICDE.2008.4497511"},{"key":"e_1_3_2_1_31_1","doi-asserted-by":"publisher","DOI":"10.1145\/1265530.1265570"},{"key":"e_1_3_2_1_32_1","doi-asserted-by":"publisher","DOI":"10.1016\/0743-1066(93)90040-N"},{"key":"e_1_3_2_1_33_1","volume-title":"DBPL","author":"Tan W.-C.","year":"2003"},{"key":"e_1_3_2_1_34_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0304-3975(96)00129-6"}],"event":{"name":"EDBT\/ICDT '09: EDBT\/ICDT '09 joint conference","location":"St. Petersburg Russia","acronym":"EDBT\/ICDT '09"},"container-title":["Proceedings of the 12th International Conference on Database Theory"],"original-title":[],"link":[{"URL":"https:\/\/dl.acm.org\/doi\/10.1145\/1514894.1514930","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/dl.acm.org\/doi\/pdf\/10.1145\/1514894.1514930","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,6,18]],"date-time":"2025-06-18T13:38:43Z","timestamp":1750253923000},"score":1,"resource":{"primary":{"URL":"https:\/\/dl.acm.org\/doi\/10.1145\/1514894.1514930"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,3,23]]},"references-count":34,"alternative-id":["10.1145\/1514894.1514930","10.1145\/1514894"],"URL":"https:\/\/doi.org\/10.1145\/1514894.1514930","relation":{},"subject":[],"published":{"date-parts":[[2009,3,23]]},"assertion":[{"value":"2009-03-23","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}