YAWN: A Semantically Annotated Wikipedia XML Corpus (2009)
Ralf Schenkel, Fabian Suchanek, Gjergji Kasneci
Abstract: The paper presents YAWN, a system to convert the well-known and widely used Wikipedia collection into an XML corpus with semantically rich, self-explaining tags. We introduce algorithms to...
Abstract Social Wisdom for Search and Recommendation (2009)
Ralf Schenkel, Tom Crecelius, Mouna Kacimi, Thomas Neumann, Josiane Xavier Parreira, Marc Spaniol, ...
Social-tagging communities offer great potential for smart recommendation and “socially enhanced ” searchresult ranking. Beyond traditional forms of collaborative recommendation that are based on...
Making SENSE: Socially ENhanced Search and Exploration ABSTRACT (2009)
Tom Crecelius, Mouna Kacimi, Sebastian Michel, Thomas Neumann, Josiane Xavier Parreira, Ralf Schenkel, ...
Online communities like Flickr, del.icio.us and YouTube have established themselves as very popular and powerful services for publishing and searching contents, but also for identifying other users...
TopX – AdHoc and Feedback Tasks (2008)
Martin Theobald, Andreas Broschart, Ralf Schenkel, Silvana Solomon, Gerhard Weikum
Abstract. This paper describes the setup and results of our contributions
YAWN: A Semantically Annotated Wikipedia XML Corpus (2008)
Ralf Schenkel, Fabian Suchanek, Gjergji Kasneci
{schenkel,suchanek,kasneci} aO mpi-inf.mpg.de Abstract: The paper presents YAWN, a system to convert the well-known and widely used Wikipedia collection into an XML corpus with semantically rich,...
1 Motivation and Background Summary of Research Activities (2008)
The world has recently seen a tremendous proliferation in the use of XML for data exchange. In addition, XML is increasingly used as a replacement for HTML on the Web or in large intranets. As XML...
der Universität des Saarlandes (2008)
Ralf Schenkel, Doktors Der Ingenieurwissenschaften, Fakultät I Prof, Dr. Rainer Schulze-pillot-ziemen, ...
KURZFASSUNG.............................................................................................. 9...
YAWN: A Semantically Annotated Wikipedia XML Corpus (2008)
Ralf Schenkel, Fabian Suchanek, Gjergji Kasneci
Abstract: The paper presents YAWN, a system to convert the well-known and widely used Wikipedia collection into an XML corpus with semantically rich, self-explaining tags. We introduce algorithms to...
TopX: Efficient and versatile top-k query processing for semistructured data (2008)
Martin Theobald, Holger Bast, Debapriyo Majumdar, Ralf Schenkel Gerhard, Martin Theobald, Holger Bast, ...
Abstract Recent IR extensions to XML query languages such as Xpath 1.0 Full-Text or the NEXI query language of the INEX benchmark series reflect the emerging interest in IR-style ranked retrieval...
For Topx, Osama Sammodi, Prof Dr, Gerhard Weikum, Dr. Ralf Schenkel, Prof Dr, ...
Hereby I confirm that this thesis is my own work and that I have documented all
TopX: Efficient and versatile top-k query processing for semistructured data (2008)
Martin Theobald, Ralf Schenkel, Gerhard Weikum
Abstract: This paper presents a comprehensive overview of the TopX search engine, an extensive framework for unified indexing and querying large collections of unstructured, semistructured, and...
TopX: Efficient and versatile top-k query processing for semistructured data (2008)
Martin Theobald, Ralf Schenkel, Gerhard Weikum
Abstract: This paper presents a comprehensive overview of the TopX search engine, an extensive framework for unified indexing and querying large collections of unstructured, semistructured, and...
Exploiting Social Relations for Query Expansion and Result Ranking (2008)
Bender, Matthias, Crecelius, Tom, Kacimi, Mouna, Michel, Sebastian, Neumann, Thomas, Parreira, Josiane Xavier, ...
Online communities have recently become a popular tool for publishing and searching content, as well as for finding and connecting to other users that share common interests. The content is typically...
Broschart, Andreas, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard
This paper describes the setup and results of the Max-Planck-Institut f{\"u}r Informatik's contributions for the INEX 2007 AdHoc Track task. The runs were produced with TopX, a search engine for...
Making SENSE: Socially Enhanced Search and Exploration (2008)
Crecelius, Tom, Kacimi, Mouna, Michel, Sebastian, Neumann, Thomas, Parreira, Josiane Xavier, Schenkel, Ralf, ...
Online communities like Flickr, del.icio.us and YouTube have established themselves as very popular and powerful services for publishing and searching contents, but also for identifying other users...
Social Recommendations At Work (2008)
Crecelius, Tom, Kacimi, Mouna, Michel, Sebastian, Neumann, Thomas, Parreira, Josiane Xavier, Schenkel, Ralf, ...
Optimizing Distributed Top-k Queries (2008)
Neumann, Thomas, Bender, Matthias, Michel, Sebastian, Schenkel, Ralf, Triantafillou, Peter, Weikum, Gerhard
Top-k query processing is a fundamental building block for efficient ranking in a large number of applications. Efficiency is a central issue, especially for distributed settings, when the data is...
Fine-Grained Relevance Feedback for XML Retrieval (Demo) (2008)
Pan, Hanglin, Schenkel, Ralf, Weikum, Gerhard
This demonstration presents an XML IR system that allows users to give feedback of different granularities and types, using Dempster-Shafer theory of evidence to compute expanded and reweighted...
Efficient Top-k Querying over Social-Tagging Networks (2008)
Schenkel, Ralf, Crecelius, Tom, Kacimi, Mouna, Michel, Sebastian, Neumann, Thomas, Parreira, Josiane Xavier, ...
Online communities have become popular for publishing and searching content, as well as for finding and connecting to other users. User-generated content includes, for example, personal blogs,...
TopX: Efficient and Versatile Top-k Query Processing for Semistructured Data (2008)
Theobald, Martin, Bast, Holger, Majumdar, Debapriyo, Schenkel, Ralf, Weikum, Gerhard
Recent IR extensions to XML query languages such as Xpath 1.0 Full-Text or the NEXI query language of the INEX benchmark series reflect the emerging interest in IR-style ranked retrieval over...
Social Wisdom for Search and Recommendation (2008)
Schenkel, Ralf, Crecelius, Tom, Kacimi, Mouna, Neumann, Thomas, Parreira, Josiane Xavier, Spaniol, Marc, ...
Social-tagging communities offer great potential for smart recommendation and “socially enhanced” search result ranking. Beyond traditional forms of collaborative recommendation that are based on...
Data consistency in transactional federations is a key requirement of advanced E-service applications on the Internet, such as electronic auctions or real-estate purchase. Federated concurrency...
Silvana Solomon, Prof Dr. -ing, Gerhard Weikum, Dr. Ralf Schenkel, Prof Dr, Christoph Koch
ii Information retrieval and feedback in XML are rather new fields for researchers; natural questions arise, such as: how good are the feedback algorithms in XML IR? Can they be evaluated with...
Broschart, Andreas, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard
This paper describes the setup and results of the Max-Planck-Institut f{\"u}r Informatik's contributions for the INEX 2007 AdHoc Track task. The runs were produced with TopX, a search engine for...
Efficient Text Proximity Search (2007)
Schenkel, Ralf, Broschart, Andreas, Hwang, Seungwon, Theobald, Martin, Weikum, Gerhard
In addition to purely occurrence-based relevance models, term proximity has been frequently used to enhance retrieval quality of keyword-oriented retrieval systems. While there have been approaches...
TopX - Adhoc Track and Feedback Task (2007)
Theobald, Martin, Broschart, Andreas, Schenkel, Ralf, Solomon, Silvana, Weikum, Gerhard
This paper describes the setup and results of the Max-Planck-Institut für Informatik’s contributions for the {INEX} 2006 AdHoc Track and Feedback task. The runs were produced with the Top{X}...
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard
This paper presents a comprehensive overview of the Top{X} search engine, an extensive framework for unified indexing and querying large collections of unstructured, semistructured, and structured...
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard
This paper proposes a demo of the Top{X} search engine, an extensive framework for unified indexing, querying, and ranking of large collections of unstructured, semistructured, and structured data....
YAWN: A Semantically Annotated {Wikipedia} {XML} Corpus (2007)
Schenkel, Ralf, Suchanek, Fabian M., Kasneci, Gjergji
The paper presents YAWN, a system to convert the well-known and widely used Wikipedia collection into an XML corpus with semantically rich, self-explaining tags. We introduce algorithms to annotate...
Io-top-k: Index-access optimized top-k query processing (2006)
Holger Bast, Debapriyo Majumdar, Ralf Schenkel, Martin Theobald, Gerhard Weikum
Top-k query processing is an important building block for ranked retrieval, with applications ranging from text and data integration to distributed aggregation of network logs and sensor data. Top-k...
Feedback-Driven Structural Query Expansion for Ranked Retrieval of XML Data (2006)
Ralf Schenkel, Martin Theobald
Abstract. Relevance Feedback is an important way to enhance retrieval quality by integrating relevance information provided by a user. In XML retrieval, feedback engines usually generate an expanded...
der Naturwissenschaftlich-Technischen Fakultät I (2006)
Martin Theobald, Fakultät I Prof, Dr. Thorsten Herfet, Vorsitzender Prüfungskommission, ...
TopX ist eine Top-k Suchmaschine für Text und XML Daten. Im Gegensatz
Io-top-k: Index-access optimized top-k query processing (2006)
Holger Bast, Debapriyo Majumdar, Ralf Schenkel, Martin Theobald, Gerhard Weikum
Top-k query processing is an important building block for ranked retrieval, with applications ranging from text and data integration to distributed aggregation of network logs and sensor data. Top-k...
GeoSphereSearch: Context-Aware Geographic Web Search (Extended Abstract) (2006)
This paper presents the GeoSphereSearch engine for contextaware geographic queries on the Web. It facilitates the formulation of geographic queries and the visual presentation of discrete or...
Structural feedback for keyword-based xml retrieval (2006)
Ralf Schenkel, Martin Theobald
Abstract. Keyword-based queries are an important means to retrieve information from XML collections with unknown or complex schemas. Relevance Feedback integrates relevance information provided by a...
Io-top-k: Index-access optimized top-k query processing (2006)
Holger Bast, Debapriyo Majumdar, Ralf Schenkel, Martin Theobald, Gerhard Weikum
Top-k query processing is an important building block for ranked retrieval, with applications ranging from text and data integration to distributed aggregation of network logs and sensor data. Top-k...
IO-Top-k: Index-Access Optimized Top-k Query Processing (2006)
Bast, Holger, Majumdar, Debapriyo, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard, Dayal, Umeshwar, ...
Top-$k$ query processing is an important building block for ranked retrieval, with applications ranging from text and data integration to distributed aggregation of network logs and sensor data....
IO-Top-k at TREC 2006: Terabyte Track (2006)
Bast, Holger, Majumdar, Debapriyo, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard, Voorhees, Ellen M., ...
GeoSphereSearch: Context-Aware Geographic Web Search (2006)
Graupmann, Jens, Schenkel, Ralf, Purves, Ross, Jones, Chris
This paper presents the GeoSphereSearch engine for context-aware geographic queries on the Web. It facilitates the formulation of geographic queries and the visual presentation of discrete or...
IO-Top-k: Index-access Optimized Top-k Query Processing (2006)
Bast, Holger, Majumdar, Debapriyo, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard, Dayal, Umeshwar, ...
Top-$k$ query processing is an important building block for ranked retrieval, with applications ranging from text and data integration to distributed aggregation of network logs and sensor data....
Structural Feedback for Keyword-Based XML Retrieval (2006)
Schenkel, Ralf, Theobald, Martin, Lalmas, Mounia, MacFarlane, Andy, Rüger, Stefan M., Tombros, Anastasios, ...
Keyword-based queries are an important means to retrieve information from XML collections with unknown or complex schemas. Relevance Feedback integrates relevance information provided by a user to...
Relevance Feedback for Structural Query Expansion (2006)
Schenkel, Ralf, Theobald, Martin, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia, Kazai, Gabriella
Keyword-based queries are an important means to retrieve information from XML collections with unknown or complex schemas. Relevance Feedback integrates relevance information provided by a user to...
IO-Top-k at TREC 2006: Terabyte Track (2006)
Bast, Holger, Majumdar, Debapriyo, Schenkel, Ralf, Theobald, Martin, Weikum, Gerhard, Voorhees, Ellen M., ...
This paper describes the setup and results of our contribution to the TREC 2006 Terabyte Track. Our implementation was based on the algorithms proposed in [IO-Top-k: Index-Access Optimized Top-K...
Feedback-Driven Structural Query Expansion for Ranked Retrieval of XML Data (2006)
Schenkel, Ralf, Theobald, Martin, Ioannidis, Yannis, Scholl, Marc H., Schmidt, Joachim W., Matthes, Florian, ...
Relevance Feedback is an important way to enhance retrieval quality by integrating relevance information provided by a user. In XML retrieval, feedback engines usually generate an expanded query from...
TopX & XXL at INEX 2005 (Ad-Hoc Track) (2006)
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia, ...
We participated with two different and independent search engines in this year's INEX round: The XXL Search Engine and the TopX engine. As this is the first participation for TopX, this paper focuses...
TopX - AdHoc Track and Feedback Task (2006)
Theobald, Martin, Broschart, Andreas, Schenkel, Ralf, Solomon, Silvana, Weikum, Gerhard, Fuhr, Norbert, ...
This paper describes the setup and results of our contributions to the INEX 2006 AdHoc and Feedback tasks.
Martin Theobald, Ralf Schenkel, Gerhard Weikum
Abstract. We participated with two different and independent search engines in this year’s INEX round: The XXL Search Engine and the TopX engine. As this is the first participation for TopX, this...
Semantic similarity search on semistructured data with the XXL search engine (2005)
Abstract. Query languages for XML such as XPath or XQuery support Boolean retrieval: a query result is a (possibly restructured) subset of XML elements or entire documents that satisfy the search...
Relevance feedback for structural query expansion (2005)
Ralf Schenkel, Martin Theobald
Abstract. Keyword-based queries are an important means to retrieve information from XML collections with unknown or complex schemas. Relevance Feedback integrates relevance information provided by a...
Martin Theobald, Ralf Schenkel, Gerhard Weikum
Abstract. We participated with two different and independent search engines in this year’s INEX round: The XXL Search Engine and the TopX engine. As this is the first participation for TopX, this...
German Shegalov, Fakultät I Prof, Dr. Jörg Eschmeier, Vorsitzender Prüfungskommission, ...
ii In memory of my father Isaac To my mother Betti iii Modern Web Services applications encompass multiple distributed interacting components, possibly including millions of lines of code written in...
The SphereSearch Engine for Unified Ranked Retrieval of Heterogeneous XML and Web Documents (2005)
Jens Graupmann, Ralf Schenkel, Gerhard Weikum
This paper presents the novel SphereSearch Engine that provides unified ranked retrieval on heterogeneous XML and Web data. Its search capabilities include vague structure conditions, text content...
An Efficient and Versatile Query Engine for TopX Search (2005)
Martin Theobald, Ralf Schenkel, Gerhard Weikum
This paper presents a novel engine, coined TopX, for efficient ranked retrieval of XML documents over semistructured but nonschematic data collections. The algorithm follows the paradigm of threshold...
German Shegalov, Fakultät I Prof, Dr. Jörg Eschmeier, Vorsitzender Prüfungskommission, ...
ii In memory of my father Isaac To my mother Betti iii Modern Web Services applications encompass multiple distributed interacting components, possibly including millions of lines of code written in...
An efficient and versatile query engine for TopX search (2005)
Martin Theobald, Ralf Schenkel, Gerhard Weikum
This paper presents a novel engine, coined TopX, for efficient ranked retrieval of XML documents over semistructured but nonschematic data collections. The algorithm follows the paradigm of threshold...
An Efficient and Versatile Query Engine for TopX Search (2005)
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard, Böhm, Klemens, Jensen, Christian S., Haas, Laura M., ...
Efficient and Self-Tuning Incremental Query Expansion for Top-k Query Processing (2005)
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard, Baeza-Yates, Ricardo A., Ziviani, Nivio, Marchionini, Gary, ...
We present a novel approach for efficient and self-tuning query expansion that is embedded into a top-k query processor with candidate pruning. Traditional query expansion methods select expansion...
Semantic Similarity Search on Semistructured Data with the XXL Search Engine (2005)
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard
Query languages for XML such as XPath or XQuery support Boolean retrieval: a query result is a (possibly restructured) subset of XML elements or entire documents that satisfy the search conditions of...
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard
The HOPI index, a connection index for XML documents based on the concept of a 2--hop cover, provides space-- and time--efficient reachability tests along the ancestor, descendant, and link axes to...
The SphereSearch Engine for Unified Ranked Retrieval of Heterogeneous XML and Web Documents (2005)
Graupmann, Jens, Schenkel, Ralf, Weikum, Gerhard, Böhm, Klemens, Jensen, Christian S., Haas, Laura M., ...
Automatic Query Refinement Using Mined Semantic Relations (2005)
Graupmann, Jens, Cai, Jun, Schenkel, Ralf
With the Web of today being unstructured and semantically heterogeneous, keyword-based queries are likely to miss important results. Therefore, {\em refining} and {\em expanding} queries plays an...
TopX & XXL at INEX 2005 (2005)
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia, ...
We participated with two different and independent search engines in this year's INEX round: The XXL Search Engine and the TopX engine. As this is the first participation for TopX, this paper focuses...
Relevance Feedback for Structural Query Expansion (2005)
Schenkel, Ralf, Theobald, Martin, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia, Kazai, Gabriella
eyword-based queries are an important means to retrieve information from XML collections with unknown or complex schemas. Relevance Feedback integrates relevance information provided by a user to...
Transaktionen in föderierten Datenbanksystemen unter eingeschränkten Isolation Levels (2004)
Atomarität und Isolation von Transaktionen sind Schlüsseleigenschaften fortgeschrittener Anwendungen in föderierten Systemen, die aus verteilten, heterogenen Komponenten bestehen. Während...
Schenkel,Ralf, Theobald,Anja, Weikum,Gerhard
Information retrieval on XML combines retrieval on content data (element and attribute values) with retrieval on structural data (element and attribute names). Standard query languages for XML such...
Towards a Statistically Semantic Web (2004)
Weikum,Gerhard, Graupmann,Jens, Schenkel,Ralf, Theobald,Martin
The envisioned Semantic Web aims to provide richly annotated and explicitly structured Web pages in XML, RDF, or description logics, based upon underlying ontologies and thesauri. Ideally, this...
An Information System for Material Microstructures (2004)
Roberts,Kathrin, Mücklich,Frank, Schenkel,Ralf, Weikum,Gerhard
This paper presents an information system that supports a materialographic laboratory in classifying material samples based on microstructure images. The system uses database and Web technologies to...
Top-k Query Evaluation with Probabilistic Guarantees (2004)
Theobald,Martin, Weikum,Gerhard, Schenkel,Ralf
Top-k queries based on ranking elements of multidimensional datasets are a fundamental building block for many kinds of information discovery. The best known general-purpose algo-rithm for evaluating...
HOPI: An Efficient Connection Index for Complex XML Document Collections (2004)
Schenkel,Ralf, Theobald,Anja, Weikum,Gerhard
In this paper we present {\em HOPI}, a new connection index for XML documents based on the concept of the 2--hop cover of a directed graph introduced by Cohen et al. In contrast to most of the prior...
What's Next in XML and Databases (2004)
Garofalakis,Minos, Manolescu,Ioana, Mesiti,Marco, Mihaila,George, Schenkel,Ralf, Thuraisingham,Bhavani, ...
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia
Information retrieval on XML combines retrieval on content data (element and attribute values) with retrieval on structural data (element and attribute names). Standard query languages for XML such...
FliX: A Flexible Framework for Indexing Complex XML Document Collections (2004)
Schenkel, Ralf, Lindner, Wolfgang, Mesiti, Marco, Türker, Can, Tzitzikas, Yannis, Vakali, Athena
While there are many proposals for path indexes on XML documents, none of them is perfectly suited for indexing large-scale collections of interlinked XML documents. Existing strategies lack support...
Towards a Statistically Semantic Web (2004)
Weikum, Gerhard, Graupmann, Jens, Schenkel, Ralf, Theobald, Martin, Atzeni, Paolo, Chu, Wesley, ...
The envisioned Semantic Web aims to provide richly annotated and explicitly structured Web pages in XML, RDF, or description logics, based upon underlying ontologies and thesauri. Ideally, this...
An Information System for Material Microstructures (2004)
Roberts, Kathrin, Mücklich, Frank, Schenkel, Ralf, Weikum, Gerhard, Hatzopoulos, Michael, Manolopoulos, Yannis
This paper presents an information system that supports a materialographic laboratory in classifying material samples based on microstructure images. The system uses database and Web technologies to...
Top-k Query Evaluation with Probabilistic Guarantees (2004)
Theobald, Martin, Weikum, Gerhard, Schenkel, Ralf, Nascimento, Mario A., Özsu, M. Tamer, Kossmann, Donald, ...
Top-k queries based on ranking elements of multidimensional datasets are a fundamental building block for many kinds of information discovery. The best known general-purpose algo-rithm for evaluating...
HOPI: An Efficient Connection Index for Complex XML Document Collections (2004)
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard, Bertino, Elisa, Christodoulakis, Stavros, Plexousakis, Dimitris, ...
In this paper we present {\em HOPI}, a new connection index for XML documents based on the concept of the 2--hop cover of a directed graph introduced by Cohen et al. In contrast to most of the prior...
Query Refinement by Relevance Feedback in an XML Retrieval System (Demo) (2004)
Pan, Hanglin, Theobald, Anja, Schenkel, Ralf, Atzeni, Paolo, Chu, Wesley, Lu, Hongjun, ...
What's Next in XML and Databases (2004)
Garofalakis, Minos, Manolescu, Ioana, Mesiti, Marco, Mihaila, George, Schenkel, Ralf, Thuraisingham, Bhavani, ...
Top-k Query Evaluation with Probabilistic Guarantees (2004)
Martin Theobald, Gerhard Weikum, Ralf Schenkel
Top-k queries based on ranking elements of multidimensional datasets are a fundamental building block for many kinds of information discovery. The best known general-purpose algorithm for evaluating...
Top-k Query Evaluation with Probabilistic Guarantees (2004)
Martin Theobald, Gerhard Weikum, Ralf Schenkel
Top-k queries based on ranking elements of multidimensional datasets are a fundamental building block for many kinds of information discovery. The best known general-purpose algorithm for evaluating...
FliX: A flexible framework for indexing complex XML document collections (2004)
Abstract. While there are many proposals for path indexes on XML documents, none of them is perfectly suited for indexing large-scale collections of interlinked XML documents. Existing strategies...
What's Next in XML and Databases (2004)
Garofalakis, Minos, Manolescu, Ioana, Mesiti, Marco, Mihaila, George, Schenkel, Ralf, Thuraisingham, Bhavani, ...
Query Refinement by Relevance Feedback in an XML Retrieval System (Demo) (2004)
Pan, Hanglin, Theobald, Anja, Schenkel, Ralf, Atzeni, Paolo, Chu, Wesley, Lu, Hongjun, ...
An Information System for Material Microstructures (2004)
Roberts, Kathrin, Mücklich, Frank, Schenkel, Ralf, Weikum, Gerhard, Hatzopoulos, Michael, Manolopoulos, Yannis
This paper presents an information system that supports a materialographic laboratory in classifying material samples based on microstructure images. The system uses database and Web technologies to...
FliX: A Flexible Framework for Indexing Complex {XML} Document Collections (2004)
Schenkel, Ralf, Lindner, Wolfgang, Mesiti, Marco, Türker, Can, Tzitzikas, Yannis, Vakali, Athena
While there are many proposals for path indexes on XML documents, none of them is perfectly suited for indexing large-scale collections of interlinked XML documents. Existing strategies lack support...
HOPI: An Efficient Connection Index for Complex {XML} Document Collections (2004)
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard, Bertino, Elisa, Christodoulakis, Stavros, Plexousakis, Dimitris, ...
In this paper we present {\em HOPI}, a new connection index for XML documents based on the concept of the 2--hop cover of a directed graph introduced by Cohen et al. In contrast to most of the prior...
Top-k Query Evaluation with Probabilistic Guarantees (2004)
Theobald, Martin, Weikum, Gerhard, Schenkel, Ralf, Nascimento, Mario A., Özsu, M. Tamer, Kossmann, Donald, ...
Top-k queries based on ranking elements of multidimensional datasets are a fundamental building block for many kinds of information discovery. The best known general-purpose algo-rithm for evaluating...
Towards a Statistically Semantic Web (2004)
Weikum, Gerhard, Graupmann, Jens, Schenkel, Ralf, Theobald, Martin, Atzeni, Paolo, Chu, Wesley, ...
The envisioned Semantic Web aims to provide richly annotated and explicitly structured Web pages in XML, RDF, or description logics, based upon underlying ontologies and thesauri. Ideally, this...
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard, Fuhr, Norbert, Lalmas, Mounia, Malik, Saadia
Information retrieval on XML combines retrieval on content data (element and attribute values) with retrieval on structural data (element and attribute names). Standard query languages for XML such...
Classification and Focused Crawling for Semistructured Data (2003)
Theobald, Martin, Schenkel, Ralf, Weikum, Gerhard, Blanken, Henk, Grabs, Torsten, Schek, Hans-Jörg, ...
Ontology-Enabled XML Search (2003)
Schenkel, Ralf, Theobald, Anja, Weikum, Gerhard, Blanken, Henk, Grabs, Torsten, Schek, Hans-Jörg, ...
Transaktionen in föderierten Datenbanksystemen unter eingeschränkten Isolation Levels (2001)
Atomarität und Isolation von Transaktionen sind Schlüsseleigenschaften fortgeschrittener Anwendungen in föderierten Systemen, die aus verteilten, heterogenen Komponenten bestehen. Während...
Transaktionen in föderierten Datenbanksystemen unter eingeschränkten Isolation-Levels / (2001)
Saarbrücken, Universiẗat, Diss., 2001.
Federated transaction management with snapshot isolation (1999)
Ralf Schenkel, Gerhard Weikum, Norbert Weißenberg, Xuequn Wu
Federated transaction management (also known as multidatabase transaction management in the literature) is needed to ensure the consistency of data that is distributed across multiple, largely...
Experiences with Building a Federated Transaction Manager based on CORBA OTS (1999)
. Federated transaction management is needed to ensure the consistency of data that is distributed across multiple, largely autonomous, and possibly heterogeneous component databases and accessed by...