{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,3]],"date-time":"2026-03-03T16:50:19Z","timestamp":1772556619121,"version":"3.50.1"},"reference-count":31,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2020,2,26]],"date-time":"2020-02-26T00:00:00Z","timestamp":1582675200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>Public administrations handle large amounts of data in relation to their internal processes as well as to the services that they offer. Following public-sector information reuse regulations and worldwide open data publication trends, these administrations are increasingly publishing their data as open data. However, open data are often released without agreed data models and in non-reusable formats, reducing interoperability and efficiency in data reuse. These aspects hinder interoperability with other administrations and do not allow taking advantage of the associated knowledge in an efficient manner. This paper presents the continued work performed by the Zaragoza city council over more than 15 years in order to generate its knowledge graph, which constitutes the key piece of their data management system, whose main strengthen is the open-data-by-default policy. The main functionalities that have been developed for the internal and external exploitation of the city\u2019s open data are also presented. Finally, some city council experiences and lessons learned during this process are also explained.<\/jats:p>","DOI":"10.3390\/info11030129","type":"journal-article","created":{"date-parts":[[2020,2,27]],"date-time":"2020-02-27T03:21:16Z","timestamp":1582773676000},"page":"129","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["The Zaragoza\u2019s Knowledge Graph: Open Data to Harness the City Knowledge"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3938-2064","authenticated-orcid":false,"given":"Paola","family":"Espinoza-Arias","sequence":"first","affiliation":[{"name":"Ontology Engineering Group, ETSI Inform\u00e1ticos, Universidad Polit\u00e9cnica de Madrid, 28660 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda Jes\u00fas","family":"Fern\u00e1ndez-Ruiz","sequence":"additional","affiliation":[{"name":"Ayuntamiento de Zaragoza, V\u00eda Hispanidad 20, 50071 Zaragoza, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victor","family":"Morl\u00e1n-Plo","sequence":"additional","affiliation":[{"name":"Ayuntamiento de Zaragoza, V\u00eda Hispanidad 20, 50071 Zaragoza, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rub\u00e9n","family":"Notivol-Bezares","sequence":"additional","affiliation":[{"name":"Ayuntamiento de Zaragoza, V\u00eda Hispanidad 20, 50071 Zaragoza, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9260-0753","authenticated-orcid":false,"given":"Oscar","family":"Corcho","sequence":"additional","affiliation":[{"name":"Ontology Engineering Group, ETSI Inform\u00e1ticos, Universidad Polit\u00e9cnica de Madrid, 28660 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,2,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1016\/j.giq.2015.05.006","article-title":"An analysis of open government portals: A perspective of transparency for accountability","volume":"32","year":"2015","journal-title":"Gov. 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