{"id":"https://openalex.org/W2120349401","doi":"https://doi.org/10.1145/1084805.1084827","title":"Query answering exploiting structural properties","display_name":"Query answering exploiting structural properties","publication_year":2005,"publication_date":"2005-09-01","ids":{"openalex":"https://openalex.org/W2120349401","doi":"https://doi.org/10.1145/1084805.1084827","mag":"2120349401"},"language":"en","primary_location":{"id":"doi:10.1145/1084805.1084827","is_oa":false,"landing_page_url":"https://doi.org/10.1145/1084805.1084827","pdf_url":null,"source":{"id":"https://openalex.org/S47508943","display_name":"ACM SIGMOD Record","issn_l":"0163-5808","issn":["0163-5808","1943-5835"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319798","host_organization_name":"Association for Computing Machinery","host_organization_lineage":["https://openalex.org/P4310319798"],"host_organization_lineage_names":["Association for Computing Machinery"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ACM SIGMOD Record","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5011519788","display_name":"Francesco Scarcello","orcid":"https://orcid.org/0000-0001-7765-1563"},"institutions":[{"id":"https://openalex.org/I45204951","display_name":"University of Calabria","ror":"https://ror.org/02rc97e94","country_code":"IT","type":"education","lineage":["https://openalex.org/I45204951"]}],"countries":["IT"],"is_corresponding":true,"raw_author_name":"Francesco Scarcello","raw_affiliation_strings":["DEIS, Universit\u00e0 della Calabria, Italy","DEIS - Universita della Calabria, Italy"],"affiliations":[{"raw_affiliation_string":"DEIS, Universit\u00e0 della Calabria, Italy","institution_ids":["https://openalex.org/I45204951"]},{"raw_affiliation_string":"DEIS - Universita della Calabria, Italy","institution_ids":["https://openalex.org/I45204951"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5011519788"],"corresponding_institution_ids":["https://openalex.org/I45204951"],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":10,"citation_normalized_percentile":{"value":0.18245968,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":89,"max":96},"biblio":{"volume":"34","issue":"3","first_page":"91","last_page":"99"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9997000098228455,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10374","display_name":"Advanced Graph Theory Research","score":0.9997000098228455,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10720","display_name":"Complexity and Algorithms in Graphs","score":0.9984999895095825,"subfield":{"id":"https://openalex.org/subfields/1703","display_name":"Computational Theory and Mathematics"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11106","display_name":"Data Management and Algorithms","score":0.996399998664856,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/hyperbolic-tree","display_name":"Hyperbolic tree","score":0.9294759035110474},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.8399031162261963},{"id":"https://openalex.org/keywords/bounded-function","display_name":"Bounded function","score":0.5760543346405029},{"id":"https://openalex.org/keywords/measure","display_name":"Measure (data warehouse)","score":0.5399070382118225},{"id":"https://openalex.org/keywords/theoretical-computer-science","display_name":"Theoretical computer science","score":0.523455798625946},{"id":"https://openalex.org/keywords/constant","display_name":"Constant (computer programming)","score":0.505924642086029},{"id":"https://openalex.org/keywords/database","display_name":"Database","score":0.1992373764514923},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.1553667187690735},{"id":"https://openalex.org/keywords/programming-language","display_name":"Programming language","score":0.08325913548469543}],"concepts":[{"id":"https://openalex.org/C97654310","wikidata":"https://www.wikidata.org/wiki/Q574023","display_name":"Hyperbolic tree","level":4,"score":0.9294759035110474},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.8399031162261963},{"id":"https://openalex.org/C34388435","wikidata":"https://www.wikidata.org/wiki/Q2267362","display_name":"Bounded function","level":2,"score":0.5760543346405029},{"id":"https://openalex.org/C2780009758","wikidata":"https://www.wikidata.org/wiki/Q6804172","display_name":"Measure (data warehouse)","level":2,"score":0.5399070382118225},{"id":"https://openalex.org/C80444323","wikidata":"https://www.wikidata.org/wiki/Q2878974","display_name":"Theoretical computer science","level":1,"score":0.523455798625946},{"id":"https://openalex.org/C2777027219","wikidata":"https://www.wikidata.org/wiki/Q1284190","display_name":"Constant (computer programming)","level":2,"score":0.505924642086029},{"id":"https://openalex.org/C77088390","wikidata":"https://www.wikidata.org/wiki/Q8513","display_name":"Database","level":1,"score":0.1992373764514923},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.1553667187690735},{"id":"https://openalex.org/C199360897","wikidata":"https://www.wikidata.org/wiki/Q9143","display_name":"Programming language","level":1,"score":0.08325913548469543},{"id":"https://openalex.org/C70984080","wikidata":"https://www.wikidata.org/wiki/Q2619102","display_name":"Hyperbolic manifold","level":3,"score":0.0},{"id":"https://openalex.org/C92047909","wikidata":"https://www.wikidata.org/wiki/Q204034","display_name":"Hyperbolic function","level":2,"score":0.0},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.1145/1084805.1084827","is_oa":false,"landing_page_url":"https://doi.org/10.1145/1084805.1084827","pdf_url":null,"source":{"id":"https://openalex.org/S47508943","display_name":"ACM SIGMOD Record","issn_l":"0163-5808","issn":["0163-5808","1943-5835"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319798","host_organization_name":"Association for Computing Machinery","host_organization_lineage":["https://openalex.org/P4310319798"],"host_organization_lineage_names":["Association for Computing Machinery"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"ACM SIGMOD Record","raw_type":"journal-article"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.117.1718","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.117.1718","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"http://www.sigmod.org/sigmod/record/issues/0509/p91-column-libkin.pdf","raw_type":"text"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.507.4887","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.507.4887","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"http://wwwinfo.deis.unical.it/~frank/Papers/sigrec.pdf","raw_type":"text"},{"id":"pmh:oai:CiteSeerX.psu:10.1.1.85.6165","is_oa":false,"landing_page_url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.85.6165","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"http://www.cs.toronto.edu/~libkin/dbtheory/scarcello.pdf","raw_type":"text"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":49,"referenced_works":["https://openalex.org/W52840101","https://openalex.org/W143925898","https://openalex.org/W160964673","https://openalex.org/W179577048","https://openalex.org/W282367566","https://openalex.org/W1483892218","https://openalex.org/W1506378440","https://openalex.org/W1558832481","https://openalex.org/W1560870503","https://openalex.org/W1565494300","https://openalex.org/W1570898964","https://openalex.org/W1965022641","https://openalex.org/W1977735896","https://openalex.org/W1978282744","https://openalex.org/W1979514837","https://openalex.org/W1984868905","https://openalex.org/W1986736553","https://openalex.org/W1989783863","https://openalex.org/W1991477862","https://openalex.org/W1992810975","https://openalex.org/W2004485491","https://openalex.org/W2008536061","https://openalex.org/W2011911122","https://openalex.org/W2018798767","https://openalex.org/W2026745535","https://openalex.org/W2027519504","https://openalex.org/W2029448190","https://openalex.org/W2033325972","https://openalex.org/W2034674470","https://openalex.org/W2039610696","https://openalex.org/W2046649829","https://openalex.org/W2046652577","https://openalex.org/W2072838038","https://openalex.org/W2079057772","https://openalex.org/W2080192364","https://openalex.org/W2115822498","https://openalex.org/W2134483537","https://openalex.org/W2148417962","https://openalex.org/W2151197771","https://openalex.org/W2153597031","https://openalex.org/W2158985358","https://openalex.org/W2160983447","https://openalex.org/W2162621793","https://openalex.org/W2166162093","https://openalex.org/W2293896416","https://openalex.org/W2337098149","https://openalex.org/W2397672765","https://openalex.org/W2628596753","https://openalex.org/W4254380579"],"related_works":["https://openalex.org/W5383638","https://openalex.org/W2134402143","https://openalex.org/W2362150722","https://openalex.org/W4386827690","https://openalex.org/W4313304827","https://openalex.org/W1560870503","https://openalex.org/W2158985358","https://openalex.org/W4232719761","https://openalex.org/W4308670589","https://openalex.org/W4225304485"],"abstract_inverted_index":{"We":[0],"review":[1],"the":[2,10],"notion":[3,74],"of":[4,9,12,14,26,37,82],"hypertree":[5,66],"width,":[6],"a":[7,35],"measure":[8],"degree":[11],"cyclicity":[13],"hypergraphs":[15,57],"that":[16],"is":[17],"useful":[18],"for":[19,78],"identifying":[20,79],"and":[21,49,85],"solving":[22],"efficiently":[23],"easy":[24],"instances":[25],"hard":[27],"problems,":[28],"by":[29,62],"exploiting":[30],"their":[31,55],"structural":[32],"properties.":[33],"Indeed,":[34],"number":[36],"relevant":[38],"problems":[39],"from":[40],"different":[41],"areas,":[42],"such":[43,87],"as":[44],"database":[45,83],"theory,":[46,51],"artificial":[47],"intelligence,":[48],"game":[50],"are":[52],"tractable":[53,80],"when":[54],"underlying":[56],"have":[58],"small":[59],"(i.e.,":[60],"bounded":[61],"some":[63],"fixed":[64],"constant)":[65],"width.":[67],"In":[68],"particular,":[69],"we":[70],"describe":[71],"how":[72],"this":[73],"may":[75],"be":[76],"used":[77],"classes":[81],"queries":[84,88],"answering":[86],"in":[89],"an":[90],"efficient":[91],"way.":[92]},"counts_by_year":[{"year":2020,"cited_by_count":2},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":2},{"year":2014,"cited_by_count":2},{"year":2013,"cited_by_count":1}],"updated_date":"2026-04-05T17:49:38.594831","created_date":"2025-10-10T00:00:00"}