@inproceedings{hoser2006semantic,
  abstract = {A key argument for modeling knowledge in ontologies is the easy
re-use and re-engineering of the knowledge. However, beside
consistency checking, current ontology engineering tools provide
only basic functionalities for analyzing ontologies. Since
ontologies can be considered as (labeled, directed) graphs, graph
analysis techniques are a suitable answer for this need. Graph
analysis has been performed by sociologists for over 60 years, and
resulted in the vivid research area of Social Network Analysis
(SNA). While social network structures in general currently receive
high attention in the Semantic Web community, there are only very
few SNA applications up to now, and virtually none for analyzing the
structure of ontologies.

We illustrate in this paper the benefits of applying SNA to
ontologies and the Semantic Web, and discuss which research topics
arise on the edge between the two areas. In particular, we discuss
how different notions of centrality describe the core content and
structure of an ontology. From the rather simple notion of degree
centrality over betweenness centrality to the more complex
eigenvector centrality based on Hermitian matrices, we illustrate
the insights these measures provide on two ontologies, which are
different in purpose, scope, and size.},
  address = {Heidelberg},
  author = {Hoser, Bettina and Hotho, Andreas and Jäschke, Robert and Schmitz, Christoph and Stumme, Gerd},
  booktitle = {The Semantic Web: Research and Applications},
  editor = {Sure, York and Domingue, John},
  interhash = {344ec3b4ee8af1a2c6b86efc14917fa9},
  intrahash = {c0cdbeab23ce0fc1bff5e02c99aab012},
  month = {June},
  pages = {514-529},
  publisher = {Springer},
  series = {LNAI},
  title = {Semantic Network Analysis of Ontologies},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2006/hoser2006semantic.pdf},
  volume = 4011,
  year = 2006
}

@inproceedings{conf/dagstuhl/Stumme05,
  author = {Stumme, Gerd},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {Semantic Interoperability and Integration},
  editor = {Kalfoglou, Yannis and Schorlemmer, W. Marco and Sheth, Amit P. and Staab, Steffen and Uschold, Michael},
  ee = {http://drops.dagstuhl.de/opus/volltexte/2005/49},
  interhash = {9206884ea0e91905062366300cfc4870},
  intrahash = {225d908cff3ee338f7595032f236fd07},
  publisher = {IBFI, Schloss Dagstuhl, Germany},
  series = {Dagstuhl Seminar Proceedings},
  title = {Ontology Merging with Formal Concept Analysis},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2005/stumme2005ontology.pdf},
  volume = 04391,
  year = 2005
}

@inproceedings{ganter03creation,
  abstract = {We provide a new method for systematically structuring the top-down level of ontologies.
It is based on an interactive, top--down knowledge acquisition
process, which assures that the knowledge engineer
considers all possible cases while avoiding redundant acquisition.
The method is suited especially for creating/merging the top
part(s) of the ontologies, where high accuracy is required, and for supporting the merging of two (or more) ontologies on that level.},
  address = {Heidelberg},
  author = {Ganter, Bernhard and Stumme, Gerd},
  booktitle = {Conceptual Structures for Knowledge Creation and Communication.},
  comment = {alpha},
  editor = {de Moor, Aldo and Lex, Wilfried and Ganter, Bernhard},
  interhash = {e7193e685762aca1a3f855b06e1e4289},
  intrahash = {63bd63cb06802a5308959d611c1a017a},
  pages = {131-145},
  publisher = {Springer},
  series = {LNAI},
  title = {Creation and Merging of Ontology Top-Levels},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2003/ganter2003creation.pdf},
  volume = 2746,
  year = 2003
}

@inproceedings{tane03courseware,
  abstract = {Topics in education are changing with an ever faster pace. E-Learning
resources tend to be more and more decentralised. Users need increasingly to be able to
use the resources of the web. For this, they should have tools for finding and organizing
information in a decentral way. In this, paper, we show how an ontology-based tool
suite allows to make the most of the resources available on the web.},
  author = {Tane, Julien and Schmitz, Christoph and Stumme, Gerd and Staab, Steffen and Studer, R.},
  booktitle = {Mobiles Lernen und Forschen - Beiträge der Fachtagung an der Universität},
  comment = {alpha},
  editor = {David, Klaus and Wegner, Lutz},
  interhash = {7f33080bb78d089b24bf51c059f8f018},
  intrahash = {850949481723b7dd03768ccd96b25cb9},
  month = {November},
  pages = {93-104},
  publisher = {Kassel University Press},
  title = {The Courseware Watchdog:  an Ontology-based tool for finding and organizing
                  learning material},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2003/tane2003courseware.pdf},
  year = 2003
}

@inproceedings{stumme01bottom,
  address = {Seattle, WA, USA},
  author = {Stumme, G. and Maedche, A.},
  booktitle = {Proc. 17th Intl. Conf. on Artificial Intelligence (IJCAI '01)},
  comment = {alpha},
  editor = {Nebel, B.},
  interhash = {2ff2aa6492ba1857d18042fa4d57111d},
  intrahash = {cd6d6c64f79d13d7cf394d3a6b3858ba},
  pages = {225-230},
  title = {{FCA}-{M}erge: Bottom-Up Merging of Ontologies.},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2001/IJCAI01.pdf},
  year = 2001
}

@inproceedings{stumme00towardsanorder,
  address = {Aachen},
  author = {Stumme, G. and Studer, R. and Sure, Y.},
  booktitle = {Verbundtagung Wirtschaftsinformatik 2000},
  comment = {alpha},
  editor = {Bodendorf, F. and Grauer, M.},
  interhash = {9042498686a1b2c000cd4b0007a76bf8},
  intrahash = {83cc12ae3979a3e4108e5442b7da0b4f},
  pages = {136-149},
  publisher = {Shaker},
  title = {Towards an Order-Theoretical Foundation for Maintaining and Merging Ontologies},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2000/REFMOD00.pdf},
  year = 2000
}

@techreport{fernandez02survey,
  author = {Fernandez-Lopez, Mariano and Gomez-Perez, Asun and Euzenat, Jerome and Gangemi, Aldo and Kalfoglou, Y. and Pisanelli, D. and Schorlemmer, M. and Steve, G. and Stojanovic, Ljilajana and Stumme, Gerd and Sure, York},
  institution = {Universidad Politecnia de Madrid},
  interhash = {73c63c33ae604c7afad9cd36604f5c84},
  intrahash = {65a9d7650d99f11baa36420527fcedd9},
  title = {A survey on methodologies for developing, maintaining, integration, evaluation and
                  reengineering ontologies},
  type = {OntoWeb deliverable},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2002/OntoWeb_Del_1-4.pdf},
  year = 2002
}

@article{630607,
  abstract = {Increases in product complexity, the move toward globalization, the emergence of virtual organizations, and the increase in focus on customer orientation all demand a more thorough and systematic approach to managing knowledge. Knowledge management is a major issue for human resource management, enterprise organization, and enterprise culture. But IT plays a major supporting role in managing knowledge.The authors present an approach for ontology-based knowledge management that includes a suite of tools as well as a methodology for developing ontology-based KM systems. Their approach builds on the distinction between knowledge process and knowledge metaprocess. They illustrate their methodology with CHAR, a knowledge management system for corporate history analysis.The challenges lie in analyzing KM processes and dynamically updating the KM solution. The authors' framework is designed to help leverage these evolving systems by providing a concise view of the problem.},
  address = {Piscataway, NJ, USA},
  author = {Staab, Steffen and Studer, Rudi and Schnurr, Hans-Peter and Sure, York},
  doi = {http://dx.doi.org/10.1109/5254.912382},
  interhash = {fbd34205cd81e86c04fb7ed0c71220fd},
  intrahash = {f03dbf6a23babb4a18e753872ace1bb6},
  issn = {1541-1672},
  journal = {IEEE Intelligent Systems},
  number = 1,
  pages = {26--34},
  publisher = {IEEE Educational Activities Department},
  title = {Knowledge Processes and Ontologies},
  url = {http://portal.acm.org/citation.cfm?id=630607},
  volume = 16,
  year = 2001
}

@misc{ISO704,
  author = {of Standardization, International Organization},
  interhash = {c7b1e32acb1a58a39b2f083739f8568c},
  intrahash = {9f1dac9dfc14a47c968a0b54ea466566},
  title = {ISO 704. Terminology Work - Principles and Methods},
  year = 2000
}

@article{cimiano05learning,
  author = {Cimiano, Philipp and Hotho, Andreas and Staab, Steffen},
  date = {2007-07-26},
  ee = {http://www.jair.org/papers/paper1648.html},
  interhash = {4c09568cff62babd362aab03095f4589},
  intrahash = {eaaf0e4b3a8b29fab23b6c15ce2d308d},
  journal = {Journal on Artificial Intelligence Research},
  pages = {305-339},
  title = {Learning Concept Hierarchies from Text Corpora using Formal Concept Analysis},
  url = {http://dblp.uni-trier.de/db/journals/jair/jair24.html#CimianoHS05},
  volume = 24,
  year = 2005
}

@inbook{hesse04formal,
  author = {Hesse, Wolfgang and Tilley, Thomas Alan},
  booktitle = {Formal Concept Analysis: Foundations and Applications},
  editor = {Ganter, Bernhard and Stumme, Gerd and Wille, Rudolf},
  interhash = {54a13f608055c749302314b5c092fcc0},
  intrahash = {e1574155f034b66e6193cda6088481ab},
  pages = {288-303},
  publisher = {Springer},
  series = {LNAI },
  title = {Formal Concept Analysis used for Software Analysis and Modelling},
  volume = 3626,
  year = 2005
}

@inproceedings{gruber93towards,
  address = {Deventer, The Netherlands},
  author = {Gruber, Tom R.},
  booktitle = {Formal Ontology in Conceptual Analysis and Knowledge Representation},
  editor = {Guarino, N. and Poli, R.},
  interhash = {e606da18d41303247aa729faf2496301},
  intrahash = {5dd88ca177bfd0e4f57e567a56ad23d3},
  publisher = {Kluwer Academic Publishers},
  title = {Towards Principles for the Design of Ontologies
                  Used for Knowledge Sharing},
  year = 1993
}

@inproceedings{schmitz2006content,
  abstract = {Recently, research projects such as PADLR and SWAP
  have developed tools like Edutella or Bibster, which are targeted at
  establishing peer-to-peer knowledge management (P2PKM) systems.  In
  such a system, it is necessary to obtain provide brief semantic
  descriptions of peers, so that routing algorithms or matchmaking
  processes can make decisions about which communities peers should
  belong to, or to which peers a given query should be forwarded.

  This paper provides a graph clustering technique on
  knowledge bases for that purpose. Using this clustering, we can show
  that our strategy requires up to 58% fewer queries than the
  baselines to yield full recall in a bibliographic P2PKM scenario.},
  address = {Heidelberg},
  author = {Schmitz, Christoph and Hotho, Andreas and Jäschke, Robert and Stumme, Gerd},
  booktitle = {The Semantic Web: Research and Applications},
  editor = {Sure, York and Domingue, John},
  interhash = {d2ddbb8f90cd271dc18670e4c940ccfb},
  intrahash = {1788c88e04112a4491f19dfffb8dc39e},
  pages = {530-544},
  publisher = {Springer},
  series = {LNAI},
  title = {Content Aggregation on Knowledge Bases using Graph Clustering},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2006/schmitz2006content.pdf},
  volume = 4011,
  year = 2006
}

@inproceedings{DBLP:conf/esws/AssemMMS06,
  author = {van Assem, Mark and Malais{\'e}, V{\'e}ronique and Miles, Alistair and Schreiber, Guus},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  editor = {Sure, York and Domingue, John},
  ee = {http://dx.doi.org/10.1007/11762256_10},
  interhash = {ce44953b51e17605040d608a353ac84d},
  intrahash = {f9d4a1f59e794880d06266746822075d},
  isbn = {3-540-34544-2},
  pages = {95-109},
  publisher = {Springer},
  series = {Lecture Notes in Computer Science},
  title = {A Method to Convert Thesauri to SKOS.},
  volume = 4011,
  year = 2006
}

@inproceedings{DBLP:conf/esws/SerafiniZSB06,
  author = {Serafini, Luciano and Zanobini, Stefano and Sceffer, Simone and Bouquet, Paolo},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_4},
  interhash = {084af48010f71f02ed3e3c4db6a054e2},
  intrahash = {5306cd7f1d989d6eb0873ec425c6f223},
  pages = {4-18},
  title = {Matching Hierarchical Classifications with Attributes.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/NovacekS06,
  author = {Nov{\'a}cek, V\'{\i}t and Smrz, Pavel},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_8},
  interhash = {7c22b562cb44a73a89b1f92e94edab1a},
  intrahash = {2eee171e9a0fe2dd8002634ae5890ddf},
  pages = {65-79},
  title = {Empirical Merging of Ontologies - A Proposal of Universal Uncertainty Representation Framework.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/Hess06,
  author = {He{\ss}, Andreas},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_5},
  interhash = {ac6c4c721253215c4f3ec6883f7aed09},
  intrahash = {f3efa58e84ecfeaba1294275b426715c},
  pages = {19-33},
  title = {An Iterative Algorithm for Ontology Mapping Capable of Using Training Data.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/GhidiniS06,
  author = {Ghidini, Chiara and Serafini, Luciano},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_7},
  interhash = {d8de25dade2cba89d915922f91d5bd97},
  intrahash = {4e6b027d0d61d4f00e1d8c8aece40a28},
  pages = {50-64},
  title = {Reconciling Concepts and Relations in Heterogeneous Ontologies.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/TempichPS06,
  author = {Tempich, Christoph and Pinto, Helena Sofia and Staab, Steffen},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_11},
  interhash = {7b828eb7e6dc90df1dbd858b994e2626},
  intrahash = {8315df96f93540d71d1c801d42e03602},
  pages = {110-124},
  title = {Ontology Engineering Revisited: An Iterative Case Study.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/ZhdanovaS06,
  author = {Zhdanova, Anna V. and Shvaiko, Pavel},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_6},
  interhash = {ed71b8a0bc99acf1c97fff02f7a26c54},
  intrahash = {3d420259274be4335db14cbc95eb0b53},
  pages = {34-49},
  title = {Community-Driven Ontology Matching.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/GiunchigliaMZ06,
  author = {Giunchiglia, Fausto and Marchese, Maurizio and Zaihrayeu, Ilya},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_9},
  interhash = {c077d42bacd7fcda7f8cbb6c1984ae28},
  intrahash = {b6eb1351a8387d08fdcd3903069b5525},
  pages = {80-94},
  title = {Encoding Classifications into Lightweight Ontologies.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/BoerSW06,
  author = {de Boer, Viktor and van Someren, Maarten and Wielinga, Bob J.},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_20},
  interhash = {76531933cb64ec49fbcb391b8df150ac},
  intrahash = {a37680a6bc817a5badcc56788a04078a},
  pages = {245-258},
  title = {Extracting Instances of Relations from Web Documents Using Redundancy.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/LeiSLZUM06,
  author = {Lei, Yuangui and Sabou, Marta and Lopez, Vanessa and Zhu, Jianhan and Uren, Victoria and Motta, Enrico},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_19},
  interhash = {9327f5d87332471b84089b6c948babec},
  intrahash = {43d1ff7c23d569f92371eb4f873d6471},
  pages = {230-244},
  title = {An Infrastructure for Acquiring High Quality Semantic Metadata.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/WangLBCW06,
  author = {Wang, Ting and Li, Yaoyong and Bontcheva, Kalina and Cunningham, Hamish and Wang, Ji},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_18},
  interhash = {ed3057a6228ad3e0666545ec089738f3},
  intrahash = {0252a6aef35b9ce0baddf529405e1ffd},
  pages = {215-229},
  title = {Automatic Extraction of Hierarchical Relations from Text.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/PlessersT06,
  author = {Plessers, Peter and Troyer, Olga De},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_17},
  interhash = {bdc648c14350e2642bf1604247b10a84},
  intrahash = {6b3d083e09e3c773cda7f11692ed6532},
  pages = {200-214},
  title = {Resolving Inconsistencies in Evolving Ontologies.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/AlaniHO06,
  author = {Alani, Harith and Harris, Stephen and O'Neil, Ben},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_16},
  interhash = {820160bbfc0c96b13c654aef43e01299},
  intrahash = {30788b88df5d41c0814b786766554065},
  pages = {185-199},
  title = {Winnowing Ontologies Based on Application Use.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/KalyanpurPSG06,
  author = {Kalyanpur, Aditya and Parsia, Bijan and Sirin, Evren and Grau, Bernardo Cuenca},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_15},
  interhash = {9d6000b51eaa973ed6f3052fdf2cab92},
  intrahash = {9fb6b9b0c0233789b436aa8ec80a7fea},
  pages = {170-184},
  title = {Repairing Unsatisfiable Concepts in OWL Ontologies.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/Garcia-CastroG06,
  author = {Garcia-Castro, Raul and G{\'o}mez-P{\'e}rez, Asunci{\'o}n},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_14},
  interhash = {fcd8557db412f7dd4316980dbd83872b},
  intrahash = {0982bb60e3415de96ea982bf557ab259},
  pages = {155-169},
  title = {Benchmark Suites for Improving the RDF(S) Importers and Exporters of Ontology Development Tools.},
  year = 2006
}

@inproceedings{DBLP:conf/esws/GangemiCCL06,
  author = {Gangemi, Aldo and Catenacci, Carola and Ciaramita, Massimiliano and Lehmann, Jos},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {ESWC},
  crossref = {DBLP:conf/esws/2006},
  ee = {http://dx.doi.org/10.1007/11762256_13},
  interhash = {0c037b5a8655693215c31fd8a075f6e5},
  intrahash = {16d9216d1ac7e9f84c8839d4e3559db4},
  pages = {140-154},
  title = {Modelling Ontology Evaluation and Validation.},
  year = 2006
}

@proceedings{conf/dagstuhl/2005P4391,
  bibsource = {DBLP, http://dblp.uni-trier.de},
  booktitle = {Semantic Interoperability and Integration},
  editor = {Kalfoglou, Yannis and Schorlemmer, W. Marco and Sheth, Amit P. and Staab, Steffen and Uschold, Michael},
  interhash = {a1b33c463e25707971ebe1348978b6b4},
  intrahash = {6349dedb81818e31d34d500476171a9a},
  publisher = {IBFI, Schloss Dagstuhl, Germany},
  series = {Dagstuhl Seminar Proceedings},
  title = {Semantic Interoperability and Integration},
  volume = 04391,
  year = 2005
}