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Magdalena Ortiz

Univ.Prof.in Dr.in techn. / MSc

Research Focus

  • Logic and Computation: 100%

Research Areas

  • Knowledge Representation, Description Logics, Computational Logic, Logic, Complexity
Magdalena Ortiz

About

My research is in the field of Knowledge Representation and Reasoning with particular emphasis in Description Logics (DLs). I am interested in the use of Description Logics in data access and data management. One of the central topics of my research is studying combinations of database-inspired query languages and DLs, with emphasis on identifying combinations with favourable computational properties. 

Roles

Contact

2024W

2025S

 

2024

2023

  • Circumscription in DL-Lite: Progress Report / Bonatti, P., Di Stefano, F., Ortiz, M., & Šimkus, M. (2023). Circumscription in DL-Lite: Progress Report. In O. Kutz, C. Lutz, & A. Ozaki (Eds.), Proceedings of the 36th International Workshop on Description Logics (DL 2023) co-located with the 20th International Conference on Principles of Knowledge Representation and Reasoning  (KR 2023). CEUR-WS.org. https://doi.org/10.34726/5328
    Download: PDF (1.28 MB)
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)
  • Reconciling SHACL and Ontologies: Semantics and Validation via Rewriting (Extended Abstract) / Ahmetaj, S., Ortiz de la Fuente, M. M., Oudshoorn, A. M., & Simkus, M. (2023). Reconciling SHACL and Ontologies: Semantics and Validation via Rewriting (Extended Abstract). In Proceedings of the 36th International Workshop on Description Logics (DL 2023), co-located with the 20th International Conference on Principles of Knowledge Representation and Reasoning and the 21st International Workshop on Non-Monotonic Reasoning (KR 2023 and NMR 2023). 36th International Workshop on Description Logics (DL 2023), Rhodos, Greece. CEUR-WS.org. https://doi.org/10.34726/5397
    Download: PDF (988 KB)
    Projects: FRESH (2021–2026) / KtoAPP (2018–2025)
  • Reconciling SHACL and Ontologies: Semantics and Validation via Rewriting / Ahmetaj, S., Ortiz, M., Oudshoorn, A., & Šimkus, M. (2023). Reconciling SHACL and Ontologies: Semantics and Validation via Rewriting. In K. Gal, A. Nowé, G. J. Nalepa, R. Fairstein, & R. Rădulescu (Eds.), ECAI 2023 : 26th European Conference on Artificial Intelligence, September 30–October 4, 2023, Kraków, Poland. Including 12th Conference on Prestigious Applications of Intelligent Systems (PAIS 2023). Proceedings (pp. 27–35). IOS Press. https://doi.org/10.3233/FAIA230250
    Download: PDF (342 KB)
    Projects: FRESH (2021–2026) / KtoAPP (2018–2025) / OMEGA (2017–2022)
  • On the Expressive Power of Ontology-Mediated Queries: Capturing coNP / Lukumbuzya, S., Ortiz de la Fuente, M. M., & Simkus, M. (2023). On the Expressive Power of Ontology-Mediated Queries: Capturing coNP. In O. Kutz, C. Lutz, & A. Ozaki (Eds.), Proceedings of the 36th International Workshop on Description Logics (DL 2023) co-located with the 20th International Conference on Principles of Knowledge Representation and Reasoning  (KR 2023). CEUR-WS.org. https://doi.org/10.34726/5333
    Download: PDF (1.88 MB)
    Project: KtoAPP (2018–2025)
  • Description Logics with Pointwise Circumscription / Di Stefano, F., Ortiz, M., & Šimkus, M. (2023). Description Logics with Pointwise Circumscription. In E. Elking (Ed.), Proceedings of the Thirty-Second International Joint Conference on Artificial Intelligence (IJCAI-23) (pp. 3167–3175). International Joint Conferences on Artificial Intelligence. https://doi.org/10.24963/ijcai.2023/353
    Download: PDF (193 KB)
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)

2022

  • Magic Shapes for SHACL Validation / Ahmetaj, S., Löhnert, B., Ortiz de la Fuente, M. M., & Simkus, M. (2022). Magic Shapes for SHACL Validation. Proceedings of the VLDB Endowment, 15(10), 2284--2296. https://doi.org/10.14778/3547305.3547329
    Projects: FRESH (2021–2026) / KtoAPP (2018–2025) / OMEGA (2017–2022)
  • Actions over Core-Closed Knowledge Bases / Cauli, C., Ortiz, M., & Piterman, N. (2022). Actions over Core-Closed Knowledge Bases. In J. Blanchette, L. Kovacs, & D. Pattinson (Eds.), Automated Reasoning.  IJCAR 2022 (pp. 281–299). Springer. https://doi.org/10.1007/978-3-031-10769-6_17

2021

  • Ontologies for On-Demand Designof Data-Centric Systems / Ortiz de la Fuente, M. M. (2021). Ontologies for On-Demand Designof Data-Centric Systems. In Formal Concept Analysis. International Conference on Formal Concept Analysis ICFCA, Unknown. Springer Lecture Notes in Computer Science. http://hdl.handle.net/20.500.12708/55671
  • Closed- and Open-world Reasoning in DL-Lite for Cloud Infrastructure Security (Extended Abstract) / Cauli, C., Ortiz de la Fuente, M. M., & Piterman, N. (2021). Closed- and Open-world Reasoning in DL-Lite for Cloud Infrastructure Security (Extended Abstract). In Proceedings of the 34th International Workshop on Description Logics (DL 2021). 34th International Workshop on Description Logics (DL 2021), Bratislava, Slovenia. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/58750
  • Reasoning about Explanations for Non-validation in SHACL (Extended abstract) / Ahmetaj, S., David, R., Ortiz de la Fuente, M. M., Polleres, A., Shehu, B., & Simkus, M. (2021). Reasoning about Explanations for Non-validation in SHACL (Extended abstract). In Proceedings of the 34th International Workshop on Description Logics (DL 2021). 34th International Workshop on Description Logics (DL 2021), Bratislava, Slovakia. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55685
  • Reasoning about Explanations for Non-validation in SHACL / Ahmetaj, S., David, R., Ortiz, M., Polleres, A., Shehu, B., & Šimkus, M. (2021). Reasoning about Explanations for Non-validation in SHACL. In Proceedings of the Eighteenth International Conference on Principles of Knowledge Representation and Reasoning. KR 2021 - 18th International Conference on Principles of Knowledge Representation and Reasoning, virtual event, Unknown. https://doi.org/10.24963/kr.2021/2
  • Closed- and Open-world Reasoning in DL-Lite for Cloud Infrastructure Security / Cauli, C., Ortiz, M., & Piterman, N. (2021). Closed- and Open-world Reasoning in DL-Lite for Cloud Infrastructure Security. In Proceedings of the Eighteenth International Conference on Principles of Knowledge Representation and Reasoning. KR 2021 - 18th International Conference on Principles of Knowledge Representation and Reasoning, virtual event, Unknown. https://doi.org/10.24963/kr.2021/17
  • Magic Shapes for Validation in SHACL / Ahmetaj, S., Loehnert, B., Ortiz de la Fuente, M. M., & Simkus, M. (2021). Magic Shapes for Validation in SHACL. In Proceedings of the ISWC 2021 Posters, Demos and Industry Tracks: From Novel Ideas to Industrial Practice co-located with 20th International Semantic Web Conference (ISWC 2021). ISWC 2021 - The 20th International Semantic Web Conference, online event, Unknown. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55686

2020

  • An ExpTime Upper Bound for ALC with Integers (Extended Version) / Labai, N., Simkus, M., & Ortiz, M. (2020). An ExpTime Upper Bound for ALC with Integers (Extended Version). arXiv. https://doi.org/10.48550/arXiv.2006.02078
  • Ontology Focusing: Knowledge-Enriched Databases on Demand / Gogacz, T., Gutierrez-Basulto, V., Ibanez Garcia, Y. A., Murlak, F., Ortiz de la Fuente, M. M., & Simkus, M. (2020). Ontology Focusing: Knowledge-Enriched Databases on Demand. In ECAI 2020 - 24th European Conference on Artificial Intelligence (pp. 745–752). Frontiers in Artificial Intelligence and Applications. http://hdl.handle.net/20.500.12708/55576
  • Pebble-Intervals Automata and FO² with Two Orders / Labai, N., Kotek, T., Ortiz, M., & Veith, H. (2020). Pebble-Intervals Automata and FO2 with Two Orders. In Language and Automata Theory and Applications (pp. 208–221). Lecture Notes in Computer Science (LNCS). https://doi.org/10.1007/978-3-030-40608-0_14
  • Query Rewriting for Ontology-Mediated Conditional Answers / Andresel, M., Ortiz, M., & Simkus, M. (2020). Query Rewriting for Ontology-Mediated Conditional Answers. In V. Conitzer & F. Sha (Eds.), Proceedings of the AAAI Conference on Artificial Intelligence (pp. 2734–2741). AAAI-20 Technical Tracks. https://doi.org/10.1609/aaai.v34i03.5660
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)
  • Stable Model Semantics for Recursive SHACL / Andresel, M., Corman, J., Ortiz, M., Reutter, J. L., Savkovic, O., & Simkus, M. (2020). Stable Model Semantics for Recursive SHACL. In Proceedings of The Web Conference 2020. International World Wide Web Conference (WWW), UK, Unknown. ACM. https://doi.org/10.1145/3366423.3380229
  • Rewritability Results for OMQs with Closed Predicates / Ortiz de la Fuente, M. M. (2020). Rewritability Results for OMQs with Closed Predicates. In Proceedings of the 33rd International Workshop on Description Logics (DL 2020) co-located with the 17th International Conference on Principles of Knowledge Representation and Reasoning (KR 2020). Proceedings of the 33rd International Workshop on Description Logics (DL 2020) co-located with the 17th International Conference on Principles of Knowledge Representation and Reasoning (KR 2020), Rhodes, Greece. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55578
  • A Framework for Exploratory Query Answering with Ontologies / Andresel, M.-P., Ibanez Garcia, Y. A., & Ortiz de la Fuente, M. M. (2020). A Framework for Exploratory Query Answering with Ontologies. In Proceedings of the 33rd International Workshop on Description Logics (DL 2020) co-located with the 17th International Conference on Principles of Knowledge Representation and Reasoning (KR 2020). Proceedings of the 33rd International Workshop on Description Logics (DL 2020) co-located with the 17th International Conference on Principles of Knowledge Representation and Reasoning (KR 2020), Rhodes, Greece. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55577
  • An ExpTime Upper Bound for ALC with Integers / Labai, N., Simkus, M., & Ortiz de la Fuente, M. M. (2020). An ExpTime Upper Bound for ALC with Integers. In D. Calvanese, E. Erdem, & M. Thielscher (Eds.), Proceedings of the Seventeenth International Conference on Principles of Knowledge Representation and Reasoning. AAAI Press. https://doi.org/10.24963/kr.2020/61
  • Datalog Rewritability and Data Complexity of ALCHOIF with Closed Predicates / Gogacz, T., Lukumbuzya, S., Simkus, M., & Ortiz de la Fuente, M. M. (2020). Datalog Rewritability and Data Complexity of ALCHOIF with Closed Predicates. In D. Calvanese, E. Erdem, & M. Thielscher (Eds.), Proceedings of the Seventeenth International Conference on Principles of Knowledge Representation and Reasoning. AAAI Press. https://doi.org/10.24963/kr.2020/44
  • Resilient Logic Programs: Answer Set Programs Challenged by Ontologies / Ortiz de la Fuente, M. M., Simkus, M., & Lukumbuzya, S. (2020). Resilient Logic Programs: Answer Set Programs Challenged by Ontologies. In V. Conitzer & F. Sha (Eds.), Proceedings of the AAAI Conference on Artificial Intelligence (pp. 2917–2924). AAAI-20 Technical Tracks. https://doi.org/10.1609/aaai.v34i03.5683
  • Polynomial rewritings from expressive Description Logics with closed predicates to variants of Datalog / Ahmetaj, S., Ortiz, M., & Šimkus, M. (2020). Polynomial rewritings from expressive Description Logics with closed predicates to variants of Datalog. Artificial Intelligence, 280(103220), 103220. https://doi.org/10.1016/j.artint.2019.103220
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)

2019

  • Pebble-Intervals Automata and FO2 with Two Orders (Extended Version) / Labai, N., Kotek, T., Ortiz, M., & Veith, H. (2019). Pebble-Intervals Automata and FO2 with Two Orders (Extended Version). arXiv. https://doi.org/10.48550/arXiv.1912.00171
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)
  • Ontology Focusing: Knowledge-enriched Databases on Demand / Gogacz, T., Gutierrez-Basulto, V., Ibanez Garcia, Y. A., Murlak, F., Ortiz, M., & Simkus, M. (2019). Ontology Focusing: Knowledge-enriched Databases on Demand. arXiv. https://doi.org/10.48550/arXiv.1904.00195
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)
  • Optimizing Horn-SHIQ Reasoning for OBDA / Bajraktari, L., Ortiz de la Fuente, M. M., & Xiao, G. (2019). Optimizing Horn-SHIQ Reasoning for OBDA. In The Semantic Web – ISWC 2019 18th International Semantic Web Conference, Auckland, New Zealand, October 26–30, 2019, Proceedings, Part I. ISWC 2019 - International Semantic Web Conference, Auckland, New Zealand. Springer. https://doi.org/10.1007/978-3-030-30793-6_5
    Project: KtoAPP (2018–2025)
  • Relaxing and Restraining Queries for OBDA / Andresel, M.-P., Ibanez Garcia, Y. A., Ortiz de la Fuente, M. M., & Simkus, M. (2019). Relaxing and Restraining Queries for OBDA. In Proceedings of the AAAI Conference on Artificial Intelligence (pp. 2654–2661). https://doi.org/10.1609/aaai.v33i01.33012654
    Projects: KtoAPP (2018–2025) / OMEGA (2017–2022)
  • From Complete to Incomplete Data and Back in Ontology-Enriched Databases / Ortiz de la Fuente, M. M. (2019). From Complete to Incomplete Data and Back in Ontology-Enriched Databases. In A. Hogan & T. Milo (Eds.), Aidan Hogan, Tova Milo: Proceedings of the 13th Alberto Mendelzon International Workshop on Foundations of Data Management, Asunción, Paraguay, June 3-7, 2019. CEUR Workshop proceedings. http://hdl.handle.net/20.500.12708/55530
  • Ontology-Mediated Queries from Examples: a Glimpse at the DL-Lite Case / Ortiz, M. (2019). Ontology-Mediated Queries from Examples: a Glimpse at the DL-Lite Case. In D. Calvanese & L. Iocchi (Eds.), EPiC Series in Computing. EPiC Series in Computing, Easychair. https://doi.org/10.29007/jhtz
  • Answer Set Programs Challenged by Ontologies / Ortiz de la Fuente, M. M., Simkus, M., & Lukumbuzya, S. (2019). Answer Set Programs Challenged by Ontologies. In M. Simkus & G. Weddell (Eds.), 32nd International Workshop on Description Logics. CEUR Workshop proceedings. http://hdl.handle.net/20.500.12708/55531

2018

  • Taming Complex Role Inclusions for DL-Lite / Andresel, M.-P., Ibanez Garcia, Y. A., Ortiz de la Fuente, M. M., & Simkus, M. (2018). Taming Complex Role Inclusions for DL-Lite. In Proceedings of the 31st International Workshop on Description Logics co-located with 16th International Conference on Principles of Knowledge Representation and Reasoning (KR 2018), Tempe, Arizona, US, October 27th - to - 29th, 2018. (p. 12). CEUR-WS.org. http://hdl.handle.net/20.500.12708/57607
  • Combining Rules and Ontologies into Clopen Knowledge Bases / Bajraktari, L., Ortiz de la Fuente, M. M., & Simkus, M. (2018). Combining Rules and Ontologies into Clopen Knowledge Bases. In Proceedings of the Thirty-Second AAAI Conference on Artificial Intelligence e (AAAI-18) (pp. 1728–1735). http://hdl.handle.net/20.500.12708/57703
  • A Tool for Building Topic-specific Ontologies Using a Knowledge Graph / Böhm, K., & Ortiz de la Fuente, M. M. (2018). A Tool for Building Topic-specific Ontologies Using a Knowledge Graph. In Proceedings of the 31st International Workshop on Description Logics co-located with 16th International Conference on Principles of Knowledge Representation and Reasoning (KR 2018), Tempe, Arizona, US, October 27th - to - 29th, 2018. (p. 12). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/57716
  • Relaxing and Restraining Queries for OBDA - Extended Abstract / Andresel, M.-P., Ibanez Garcia, Y. A., Ortiz de la Fuente, M. M., & Simkus, M. (2018). Relaxing and Restraining Queries for OBDA - Extended Abstract. In Principles of Knowledge Representation and Reasoning: Proceedings of the Sixteenth International Conference, KR 2018, Tempe, Arizona, 30 October-2 November 2018. (pp. 617–618). http://hdl.handle.net/20.500.12708/57608
  • Compiling Model Representations for Querying Large ABoxes in Expressive DLs / Bajraktari, L., Ortiz, M., & Simkus, M. (2018). Compiling Model Representations for Querying Large ABoxes in Expressive DLs. In Proceedings of the Twenty-Seventh International Joint Conference on Artificial Intelligence. IJCAI - International Joint Conference on Artificial Intelligence, Stockholm, Sweden. https://doi.org/10.24963/ijcai.2018/234
  • Research Directions for Principles of Data Management (Dagstuhl Perspectives Workshop 16151) / Abiteboul, S., Arenas, M., Barceló, P., Bienvenu, M., Calvanese, D., David, C., Hull, R., Hüllermeier, E., Kimelfeld, B., Libkin, L., Martens, W., Milo, T., Murlak, F., Neven, F., Ortiz de la Fuente, M. M., Schwentick, T., Stoyanovich, J., Su, J., Suciu, D., … Yi, K. (2018). Research Directions for Principles of Data Management (Dagstuhl Perspectives Workshop 16151). In Dagstuhl Perspectives Workshop 16151 (Vols. 7, 1, Issue 1, pp. 1–29). https://doi.org/10.4230/DagMan.7.1.1
  • Rewriting Guarded Existential Rules into Small Datalog Programs / Ahmetaj, S., Ortiz de la Fuente, M. M., & Simkus, M. (2018). Rewriting Guarded Existential Rules into Small Datalog Programs. In B. Kimelfeld & Y. Amsterdamer (Eds.), 21st International Conference on Database Theory, {ICDT} 2018 (pp. 1–24). Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik. https://doi.org/10.4230/LIPIcs.ICDT.2018.4
  • Improving Data Management using Domain Knowledge / Ortiz, M. (2018). Improving Data Management using Domain Knowledge. In Proceedings of the Twenty-Seventh International Joint Conference on Artificial Intelligence. International Joint Conference on Artificial Intelligence (IJCAI), Edinburgh, Scotland, UK, Austria. https://doi.org/10.24963/ijcai.2018/814
  • Proceedings of the 31st International Workshop on Description Logics co-located with 16th International Conference on Principles of Knowledge Representation and Reasoning (KR 2018), Tempe, Arizona, US, October 27-29, 2018. / Proceedings of the 31st International Workshop on Description Logics co-located with 16th International Conference on Principles of Knowledge Representation and Reasoning (KR 2018), Tempe, Arizona, US, October 27-29, 2018. (2018). In M. M. Ortiz de la Fuente & T. Schneider (Eds.), CEUR Workshop Proceedings. CEUR-WS.org. http://hdl.handle.net/20.500.12708/24559

2017

  • Clopen Knowledge Bases: Combining Description Logics and Answer Set Programming / Bajraktari, L., Ortiz de la Fuente, M. M., & Simkus, M. (2017). Clopen Knowledge Bases: Combining Description Logics and Answer Set Programming. In A. Artale, B. Glimm, & R. Kontchakov (Eds.), Proceedings of the 30th International Workshop on Description Logics (pp. 1–13). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55477
  • Constructive Satisfiability Procedure for ALCP(Z) (Preliminary Report) / Labai, N., Homola, M., & Ortiz de la Fuente, M. M. (2017). Constructive Satisfiability Procedure for ALCP(Z) (Preliminary Report). In A. Artale, B. Glimm, & R. Kontchakov (Eds.), Proceedings of the 30th International Workshop on Description Logics (pp. 1–13). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55478
  • Querying with Vague Quantifiers Using Probabilistic Semantics / Fermüller, C., Hofer, M., & Ortiz, M. (2017). Querying with Vague Quantifiers Using Probabilistic Semantics. In H. Christiansen, H. Jaudoin, P. Chountas, T. Andreasen, & H. L. Larsen (Eds.), Flexible Query Answering Systems : 12th International Conference, FQAS 2017, London, UK, June 21–22, 2017, Proceedings. Springer Cham. https://doi.org/10.1007/978-3-319-59692-1_2
    Download: PDF (573 KB)
  • Managing Change in Graph-Structured Data Using Description Logics / Ahmetaj, S., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2017). Managing Change in Graph-Structured Data Using Description Logics. ACM Transactions on Computational Logic, 18(4), 1–35. https://doi.org/10.1145/3143803

2016

  • The Impact of Active Domain Predicates on Guarded Existential Rules / Gottlob, G., Pieris, A., & Šimkus, M. (2016). The Impact of Active Domain Predicates on Guarded Existential Rules. In M. M. Ortiz de la Fuente & S. Schlobach (Eds.), Web Reasoning and Rule Systems (pp. 94–110). Lecture Notes in Computer Science / Springer. https://doi.org/10.1007/978-3-319-45276-0_8
    Projects: HINT (2012–2017) / START (2014–2022)
  • Verification of Evolving Graph-structured Data under Expressive Path Constraints / Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Verification of Evolving Graph-structured Data under Expressive Path Constraints. In W. Martens & T. Zeume (Eds.), 19th International Conference on Database Theory, ICDT 2016, Bordeaux, France, March 15-18, 2016 (pp. 15:1-15:19). Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik. https://doi.org/10.4230/LIPIcs.ICDT.2016.15
    Projects: HINT (2012–2017) / SEE (2012–2016) / SemDat (2012–2016)
  • Research Directions for Principles of Data Management (Abridged) / Abiteboul, S., Arenas, M., Barceló, P., Bienvenu, M., Calvanese, D., David, C., Hull, R., Hüllermeier, E., Kimelfeld, B., Libkin, L., Martens, W., Milo, T., Murlak, F., Neven, F., Ortiz, M., Schwentick, T., Stoyanovich, J., Su, J., Suciu, D., … Yi, K. (2016). Research Directions for Principles of Data Management (Abridged). ACM SIGMOD Record, 45(4), 5–17. https://doi.org/10.1145/3092931.3092933
  • Managing Change in Graph-Structured Data Using Description Logics / Ortiz de la Fuente, M. M., & Simkus, M. (2016). Managing Change in Graph-Structured Data Using Description Logics. Workshop on New Trends in Belief Change, Vienna, Austria. http://hdl.handle.net/20.500.12708/86468
    Project: SemDat (2012–2016)
  • Query Answering with Description Logic Ontologies / Bienvenu, M., & Ortiz de la Fuente, M. M. (2016). Query Answering with Description Logic Ontologies. 28th European Summer School in Logic, Language and Information, Bolzano, Italy, EU. http://hdl.handle.net/20.500.12708/86464
    Project: SemDat (2012–2016)
  • Expressive Ontology and Query Languages for Data Access and Management / Ortiz de la Fuente, M. M. (2016). Expressive Ontology and Query Languages for Data Access and Management. 12th Reasoning Web Summer School (RW 2016), Aberdeen, Scotland, EU. http://hdl.handle.net/20.500.12708/86463
    Project: SemDat (2012–2016)
  • A Compilation Technique for Interactive Ontology-mediated Data Exploration / Andresel, M.-P., Ortiz de la Fuente, M. M., & Simkus, M. (2016). A Compilation Technique for Interactive Ontology-mediated Data Exploration. In M. Lenzerini & R. Penaloza (Eds.), Proceedings of the 29th International Workshop on Description Logics, Cape Town, South Africa, April 22-25, 2016. (p. 12). CEUR Workshop Proceedings / CEUR-WS.org. http://hdl.handle.net/20.500.12708/56678
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Polynomial Disjunctive Datalog Rewritings of Instance Queries in Expressive Description Logics / Ahmetaj, S., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Polynomial Disjunctive Datalog Rewritings of Instance Queries in Expressive Description Logics. In M. Lenzerini & R. Penaloza (Eds.), Proceedings of the 29th International Workshop on Description Logics, Cape Town, South Africa, April 22-25, 2016. (p. 13). CEUR Workshop Proceedings / CEUR-WS.org. http://hdl.handle.net/20.500.12708/56673
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Closed Predicates in Description Logics: Results on Combined Complexity / Ngo, N., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Closed Predicates in Description Logics: Results on Combined Complexity. In R. Pichler & A. S. da Silva (Eds.), Proceedings of the 10th Alberto Mendelzon International Workshop on Foundations of Data Management, Panama City, Panama, May 8-10, 2016 (p. 5). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56672
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Polynomial Datalog Rewritings for Ontology Mediated Queries with Closed Predicates / Ahmetaj, S., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Polynomial Datalog Rewritings for Ontology Mediated Queries with Closed Predicates. In R. Pichler & A. S. da Silva (Eds.), Proceedings of the 10th Alberto Mendelzon International Workshop on Foundations of Data Management, Panama City, Panama, May 8-10, 2016 (p. 5). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/56671
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Closed Predicates in Description Logics: Results on Combined Complexity / Ngo, N., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Closed Predicates in Description Logics: Results on Combined Complexity. In C. Baral, J. P. Delgrande, & F. Wolter (Eds.), Principles of Knowledge Representation and Reasoning: Proceedings of the Fifteenth International Conference, {KR} 2016, Cape Town, South Africa, April 25-29, 2016. (pp. 237–246). AAAI Press. http://hdl.handle.net/20.500.12708/56676
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Polynomial Datalog Rewritings for Expressive Description Logics with Closed Predicates / Ahmetaj, S., Ortiz de la Fuente, M. M., & Simkus, M. (2016). Polynomial Datalog Rewritings for Expressive Description Logics with Closed Predicates. In S. Kambhampati (Ed.), Proceedings of the Twenty-Fifth International Joint Conference on Artificial Intelligence, IJCAI 2016, New York, NY, USA, 9-15 July 2016 (pp. 878–885). IJCAI/AAAI Press. http://hdl.handle.net/20.500.12708/56675
    Projects: HINT (2012–2017) / SemDat (2012–2016)
  • Web Reasoning and Rule Systems / Web Reasoning and Rule Systems. (2016). In M. M. Ortiz de la Fuente & S. Schlobach (Eds.), Lecture Notes in Computer Science. Springer, LNCS. https://doi.org/10.1007/978-3-319-45276-0
    Project: SemDat (2012–2016)

2015

2014

  • Answering Regular Path Queries in Expressive Description Logics via Alternating Tree-Automata / Calvanese, D., Eiter, T., & Ortiz, M. (2014). Answering Regular Path Queries in Expressive Description Logics via Alternating Tree-Automata. Information and Computation, 237, 12–55. https://doi.org/10.1016/j.ic.2014.04.002
    Projects: Hybride Wissensbasen (2008–2012) / SemDat (2012–2016)
  • SPARQL Update for Materialized Triple Stores under DL-Lite_RDFS Entailment / Ahmeti, A., Calvanese, D., & Polleres, A. (2014). SPARQL Update for Materialized Triple Stores under DL-Lite_RDFS Entailment. In M. Bienvenu, M. M. Ortiz de la Fuente, R. Rosati, & M. Simkus (Eds.), Informal Proceedings of the 27th International Workshop on Description Logics, Vienna, Austria, July 17-20, 2014 (p. 13). CEUR-WS. http://hdl.handle.net/20.500.12708/55895
    Project: SEE (2012–2016)
  • Towards Practical Deletion Repair of Inconsistent DL-programs / Eiter, T., Fink, M., & Stepanova, D. (2014). Towards Practical Deletion Repair of Inconsistent DL-programs. In M. Bienvenu, M. M. Ortiz de la Fuente, R. Rosati, & M. Simkus (Eds.), Informal Proceedings of the 27th International Workshop on Description Logics (pp. 169–180). CEUR-WS. http://hdl.handle.net/20.500.12708/55751
    Project: ASP (2012–2015)
  • Contextualized Knowledge Repositories with Justifiable Exceptions / Bozzato, L., Eiter, T., & Serafini, L. (2014). Contextualized Knowledge Repositories with Justifiable Exceptions. In M. Bienvenu, M. M. Ortiz de la Fuente, R. Rosati, & M. Simkus (Eds.), Informal Proceedings of the 27th International Workshop on Description Logics (pp. 112–123). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55719
  • Nested Regular Path Queries in Description Logics (Extended Abstract) / Bienvenu, M., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2014). Nested Regular Path Queries in Description Logics (Extended Abstract). In G. Gottlob & J. Perez (Eds.), Proceedings of the 8th Alberto Mendelzon Workshop on Foundations of Data Management. CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55386
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Planning Problems for Graph Structured Data in Description Logics / Ahmetaj, S., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2014). Planning Problems for Graph Structured Data in Description Logics. In M. Bienvenu, M. M. Ortiz de la Fuente, R. Rosati, & M. Simkus (Eds.), Informal Proceedings of the 27th International Workshop on Description Logics (pp. 4–7). CEUR-WS. http://hdl.handle.net/20.500.12708/55993
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Revisiting the Hardness of Query Answering in Expressive Description Logics / Ortiz, M., & Šimkus, M. (2014). Revisiting the Hardness of Query Answering in Expressive Description Logics. In R. Kontchakov & M.-L. Mugnier (Eds.), Web Reasoning and Rule Systems (pp. 216–223). Springer Lecture Notes in Computer Science. https://doi.org/10.1007/978-3-319-11113-1_18
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Nested Regular Path Queries in Description Logics / Bienvenu, M., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2014). Nested Regular Path Queries in Description Logics. In C. Baral, G. De Giacomo, & T. Eiter (Eds.), Principles of Knowledge Representation and Reasoning: Proceedings of the Fourteenth International Conference (KR 2014) (pp. 218–227). AAAI Press. http://hdl.handle.net/20.500.12708/55963
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Planning and Change in Graph Structured Data under Description Logics Constraints / Ahmetaj, S., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2014). Planning and Change in Graph Structured Data under Description Logics Constraints. In G. Gottlob & J. Perez (Eds.), Proceedings of the 8th Alberto Mendelzon Workshop on Foundations of Data Management. CEUR-Proceedings. http://hdl.handle.net/20.500.12708/55930
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Managing Change in Graph-Structured Data Using Description Logics / Ahmetaj, S., Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2014). Managing Change in Graph-Structured Data Using Description Logics. In C. E. Brodley & P. Stone (Eds.), Proceedings of the Twenty-Eighth AAAI Conference on Aritifical Intelligence (pp. 966–973). AAAI Press/IJCAI. http://hdl.handle.net/20.500.12708/55928
    Projects: FAIR (2013–2018) / SEE (2012–2016) / SemDat (2012–2016)
  • Informal Proceedings of the 27th International Workshop on Description Logics / Informal Proceedings of the 27th International Workshop on Description Logics. (2014). In M. Bienvenu, M. M. Ortiz de la Fuente, R. Rosati, & M. Simkus (Eds.), CEUR Workshop Proceedings. CEUR-Proceedings. http://hdl.handle.net/20.500.12708/23938

2013

  • Reasoning about Explanations for Negative Query Answers in DL-Lite / Calvanese, D., Ortiz, M., Simkus, M., & Stefanoni, G. (2013). Reasoning about Explanations for Negative Query Answers in DL-Lite. Journal of Artificial Intelligence Research, 48, 635–669. https://doi.org/10.1613/jair.3870
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)
  • Reasoning and Query Answering in Description Logics / Ortiz de la Fuente, M. M. (2013). Reasoning and Query Answering in Description Logics. School of the Alberto Mendelzon International Workshop on Foundations of Data Management, Puebla, Mexico, Non-EU. http://hdl.handle.net/20.500.12708/85758
  • Ontology Based Query Answering: The Story So Far / Ortiz de la Fuente, M. M. (2013). Ontology Based Query Answering: The Story So Far. In L. Bravo & M. Lenzerini (Eds.), Proceedings of the 7th Alberto Mendelzon International Workshop on Foundations of Data Management (pp. 1–14). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55143
    Project: SemDat (2012–2016)
  • Tractability Guarantees for DL-Lite Query Answering / Bienvenu, M., Ortiz de la Fuente, M. M., Simkus, M., & Xiao, G. (2013). Tractability Guarantees for DL-Lite Query Answering. In T. Eiter, B. Glimm, Y. Kazakov, & M. Krötzsch (Eds.), Informal Proceedings of the 26th International Workshop on Description Logics (pp. 41–52). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55142
    Projects: FAIR (2013–2018) / Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SEE (2012–2016) / SemDat (2012–2016)
  • Evolving Graph Databases under Description Logic Constraints / Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2013). Evolving Graph Databases under Description Logic Constraints. In T. Eiter, B. Glimm, Y. Kazakov, & M. Krötzsch (Eds.), Informal Proceedings of the 26th International Workshop on Description Logics (pp. 120–131). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/55141
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)
  • Conjunctive Regular Path Queries in Lightweight Description Logics / Bienvenu, M., Ortiz de la Fuente, M. M., & Simkus, M. (2013). Conjunctive Regular Path Queries in Lightweight Description Logics. In F. Rossi (Ed.), IJCAI 2013, Proceedings of the 23rd International Joint Conference on Artificial Intelligence (pp. 761–767). AAAI Press. http://hdl.handle.net/20.500.12708/55043
    Projects: FAIR (2013–2018) / Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SEE (2012–2016) / SemDat (2012–2016)
  • Tractable Queries for Lightweight Description Logics / Bienvenu, M., Ortiz de la Fuente, M. M., Simkus, M., & Xiao, G. (2013). Tractable Queries for Lightweight Description Logics. In F. Rossi (Ed.), IJCAI 2013, Proceedings of the 23rd International Joint Conference on Artificial Intelligence (pp. 768–774). AAAI Press. http://hdl.handle.net/20.500.12708/55042
    Projects: FAIR (2013–2018) / Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SEE (2012–2016) / SemDat (2012–2016)

2012

  • Reasoning and Query Answering in Description Logics / Ortiz, M., & Šimkus, M. (2012). Reasoning and Query Answering in Description Logics. In T. Eiter & T. Krennwallner (Eds.), Reasoning Web - Semantic Technologies for Advanced Query Answering : 8th International Summer School 2012, Vienna, Austria, September 3-8, 2012. Proceedings (pp. 1–53). Springer LNCS. https://doi.org/10.1007/978-3-642-33158-9_1
    Projects: Hybride Wissensbasen (2008–2012) / SemDat (2012–2016)
  • The Complexity of Explaining Negative Query Answers in DL-Lite / Calvanese, D., Ortiz de la Fuente, M. M., Simkus, M., & Stefanoni, G. (2012). The Complexity of Explaining Negative Query Answers in DL-Lite. In G. Brewka, T. Eiter, & S. McIlraith (Eds.), Principles of Knowledge Representation and Reasoning: Proceedings of the Thirteenth International Conference, KR 2012 (pp. 583–587). AAAI Press. http://hdl.handle.net/20.500.12708/54355
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)
  • Conjunctive query answering in the description logic SH using knots / Eiter, T., Ortiz, M., & Šimkus, M. (2012). Conjunctive query answering in the description logic SH using knots. Journal of Computer and System Sciences, 78(1), 47–85. https://doi.org/10.1016/j.jcss.2011.02.012
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)
  • Answering Expressive Path Queries over Lightweight DL Knowledge Bases / Bienvenu, M., Ortiz de la Fuente, M. M., & Simkus, M. (2012). Answering Expressive Path Queries over Lightweight DL Knowledge Bases. In Y. Kazakov, D. Lembo, & F. Wolter (Eds.), Proc. of the 2012 International Workshop on Description Logics (DL 2012) (pp. 81–91). http://hdl.handle.net/20.500.12708/54354
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)
  • Towards Practical Query Answering for Horn SHIQ. / Eiter, T., Ortiz de la Fuente, M. M., Simkus, M., Tran, T.-K., & Xiao, G. (2012). Towards Practical Query Answering for Horn SHIQ. In Y. Kazakov, D. Lembo, & F. Wolter (Eds.), Proc. of the 2012 International Workshop on Description Logics (DL 2012) (pp. 158–168). CEUR workshop proceedings. http://hdl.handle.net/20.500.12708/54289
    Projects: Hybride Wissensbasen (2008–2012) / SemDat (2012–2016)
  • Query Rewriting for Horn-SHIQ Plus Rules / Eiter, T., Ortiz de la Fuente, M. M., Simkus, M., Tran, T.-K., & Xiao, G. (2012). Query Rewriting for Horn-SHIQ Plus Rules. In J. Hoffmann & B. Selman (Eds.), Proceedings of the Twenty-Sixth AAAI Conference on Artificial Intelligence (pp. 726–733). AAAI Press. http://hdl.handle.net/20.500.12708/54357
    Projects: Hybride Wissensbasen (2008–2012) / Net2 (2010–2013) / SemDat (2012–2016)

2011

  • The Complexity of Conjunctive Query Abduction in DL-Lite / Calvanese, D., Ortiz de la Fuente, M. M., Simkus, M., & Stefanoni, G. (2011). The Complexity of Conjunctive Query Abduction in DL-Lite. In R. Rosati, S. Rudolph, & M. Zakharyaschev (Eds.), Proceedings of the 24th International Workshop on Description Logics (DL-2011), Barcelona, Spain, July 13-16, 2011 (p. 11). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/53694
  • A Practical Automata-Based Technique for Reasoning in Expressive Description Logics / Calvanese, D., Carbotta, D., & Ortiz de la Fuente, M. M. (2011). A Practical Automata-Based Technique for Reasoning in Expressive Description Logics. In T. Walsh (Ed.), Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence (pp. 798–804). AAAI Press/International Joint Conferences on Artificial Intelligence. https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-140
  • Query Answering in the Horn Fragments of the Description Logics SHOIQ and SROIQ / Ortiz de la Fuente, M. M., Rudolph, S., & Simkus, M. (2011). Query Answering in the Horn Fragments of the Description Logics SHOIQ and SROIQ. In T. Walsh (Ed.), Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence (pp. 1039–1044). AAAI Press/International Joint Conferences on Artificial Intelligence. https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-178
    Project: Hybride Wissensbasen (2008–2012)
  • Containment of Regular Path Queries under Description Logic Constraints / Calvanese, D., Ortiz de la Fuente, M. M., & Simkus, M. (2011). Containment of Regular Path Queries under Description Logic Constraints. In T. Walsh (Ed.), Proceedings of the Twenty-Second International Joint Conference on Artificial Intelligence (pp. 805–812). AAAI Press/International Joint Conferences on Artificial Intelligence. https://doi.org/10.5591/978-1-57735-516-8/IJCAI11-141
  • D3.4 Converged and Optimized Combinations of Rules and Ontologies / Feier, C., Eiter, T., Kifer, M., Mosca, A., Rezk, M., Rosati, R., Ortiz de la Fuente, M. M., Simkus, M., Tran, T.-K., & Xiao, G. (2011). D3.4 Converged and Optimized Combinations of Rules and Ontologies (D3.4). http://hdl.handle.net/20.500.12708/37097

2010

2009

2008

  • Reasoning Using Knots / Eiter, T., Ortiz, M., & Šimkus, M. (2008). Reasoning Using Knots. In I. Cervesato, H. Veith, & A. Voronkov (Eds.), Logic for Programming, Artificial Intelligence, and Reasoning (pp. 377–390). Lecture Notes in Computer Science, Springer. https://doi.org/10.1007/978-3-540-89439-1_27
  • Data complexity of query answering in expressive Description Logics via tableaux / Ortiz, M., Calvanese, D., & Eiter, T. (2008). Data complexity of query answering in expressive Description Logics via tableaux. Journal of Automated Reasoning, 41(1), 61–98. https://doi.org/10.1007/s10817-008-9102-9
  • Query Answering in the Description Logic Horn-SHIQ / Eiter, T., Gottlob, G., Ortiz, M., & Šimkus, M. (2008). Query Answering in the Description Logic Horn-SHIQ. In S. Hölldobler, C. Lutz, & H. Wansing (Eds.), Logics in Artificial Intelligence: 11th European Conference, JELIA 2008, Dresden, Germany, September 28-October 1, 2008. Proceedings (pp. 166–179). Lecture Notes in Artificial Intelligence. https://doi.org/10.1007/978-3-540-87803-2_15
  • The combined complexity of query answering in expressive DLs / Ortiz de la Fuente, M. M. (2008). The combined complexity of query answering in expressive DLs. Seminar of the KRDB Research Centre at the Faculty of Computer Science of the Free University of Bozen-Bolzano, Bolzano, Italy, EU. http://hdl.handle.net/20.500.12708/84971
    Project: Hybride Wissensbasen (2008–2012)
  • An Automata-based algorithm for description logics around SRIQ / Ortiz de la Fuente, M. M. (2008). An Automata-based algorithm for description logics around SRIQ. In M. Osorio & I. Olmos (Eds.), Fourth Latin American Workshop on Non-Monotonic Reasoning (p. 15). CEUR Workshop Proceedings. http://hdl.handle.net/20.500.12708/52484
  • Complexity of Query Answering over Expressive Knowledge Bases / Ortiz de la Fuente, M. M. (2008). Complexity of Query Answering over Expressive Knowledge Bases. In M. Montes y Gomez & M. Gonzalez Mendoza (Eds.), Proceedings of MICAI-2008, Doctoral Consortium (pp. 22–25). http://hdl.handle.net/20.500.12708/52432
  • Extending Carin to the Description Logics of the $\mathcal{SH}$ Family / Ortiz, M. (2008). Extending Carin to the Description Logics of the $\mathcal{SH}$ Family. In S. Hölldobler, C. Lutz, & H. Wansing (Eds.), Logics in Artificial Intelligence (pp. 324–337). Lecture Notes in Artificial Intelligence. https://doi.org/10.1007/978-3-540-87803-2_27
  • Worst-case Optimal Conjunctive Query Answering for an Expressive Description Logic without Inverses / Ortiz de la Fuente, M. M., Simkus, M., & Eiter, T. (2008). Worst-case Optimal Conjunctive Query Answering for an Expressive Description Logic without Inverses. In D. Fox & C. P. Gomes (Eds.), 23rd AAAI Conference on Artificial Intelligence (pp. 504–510). AAAI Press. http://hdl.handle.net/20.500.12708/52283
  • Conjunctive Query Answering in SH using Knots / Ortiz de la Fuente, M. M., Simkus, M., & Eiter, T. (2008). Conjunctive Query Answering in SH using Knots. In F. Baader, C. Lutz, & B. Motik (Eds.), Proceedings of the 21st International Workshop on Description Logics (DL2008) (p. 11). CEUR Workshop proceedings. http://hdl.handle.net/20.500.12708/52270
  • Complexity of Conjunctive Query Answering in Description Logics with Transitive Roles / Eiter, T., Lutz, C., Ortiz de la Fuente, M. M., & Simkus, M. (2008). Complexity of Conjunctive Query Answering in Description Logics with Transitive Roles (INFSYS RR-1843-08-09). http://hdl.handle.net/20.500.12708/35361
  • Answering regular path queries in expressive description logics: An automata-theoretic approach (Preliminary Version) / Calvanese, D., Eiter, T., & Ortiz de la Fuente, M. M. (2008). Answering regular path queries in expressive description logics: An automata-theoretic approach (Preliminary Version) (INFSYS RR-1843-08-05). http://hdl.handle.net/20.500.12708/35357

2007

2006

2005

 

  • Distinguished Alumna Award of the European Masters in Computational Logic
    2014 / International Organization
  • EMCL Distinguished Alumni Award
    2014 / Joint Consortium of the European Masters in Computational Logic
  • Austrian Federal Ministry for Science and Research: Award of Excellence 2010
    2010 / Austria
  • OCG-Förderpreis
    2007 / Austria
  • The Google Anita Borg Memorial Scholarship
    2007
  • ÖGAI-Preis
    2006 / Austria
  • Best Thesis Award, consortium of the European Masters in Computational Logic
    2006 / International Organization

Soon, this page will include additional information such as reference projects, activities as journal reviewer and editor, memberships in councils and committees, and other research activities.

Until then, please visit Magdalena Ortiz’s research profile in TISS .