Abstract This is the second paper in D-Lib Magazine about the ResourceSync effort conducted by th... more Abstract This is the second paper in D-Lib Magazine about the ResourceSync effort conducted by the National Information Standards Organization (NISO) and the Open Archives Initiative (OAI). The first part provided a perspective on the resource synchronization problem and introduced a template that organized possible components of a resource synchronization framework in a modular manner. This paper details a technical framework devised using that template.
Abstract. The rising popularity of RESTful Web services has recently motivated the extension of e... more Abstract. The rising popularity of RESTful Web services has recently motivated the extension of existing service orchestration engines to support the composition of services that do not rely on machine-readable descriptions. At the same time, within the Linking Open Data initiative, data sets are published conforming to the Linked Data principles, which can be naturally achieved by exposing RDF data through RESTful interfaces.
Abstract Web applications frequently leverage resources made available by remote web servers. As ... more Abstract Web applications frequently leverage resources made available by remote web servers. As resources are created, updated, deleted, or moved, these applications face challenges to remain in lockstep with changes on the server. Several approaches exist to help meet this challenge for use cases where" good enough" synchronization is acceptable. But when strict resource coverage or low synchronization latency is required, commonly accepted Web-based solutions remain illusive.
Expressing data in RDF is one of the principles to be considered when making data available as Li... more Expressing data in RDF is one of the principles to be considered when making data available as Linked Data on the Web. This can be achieved using RDF-wrappers for existing (relational) data stores or by using RDF stores as data repositories. The latter requires special RDF storage solutions, many of which are available today.
Project BRICKS aims to build a Europe-wide distributed Digital Library in the field of Cultural H... more Project BRICKS aims to build a Europe-wide distributed Digital Library in the field of Cultural Heritage. Each member organisation will run a node in the network (BRICKS node or BNode) and make its content available to the entire network. Content described in diverse Metadata standards can be searched with a unique query. Unlike other Digital Libraries, BRICKS is open and expandable, both on the organizational and the technical level.
Metadata in today's digital library systems are accessible through various incompatible interface... more Metadata in today's digital library systems are accessible through various incompatible interfaces and correspond to heterogeneous schemas. Clients that want to search over a number of distributed metadata sources require a solution that provides uniform and location transparent access to these systems without replicating the metadata stored therein. In this paper we describe a metadata integration approach that conceives these data sources as services in the sense of a service oriented architecture.
The MEKETREpository (MR) allows scholars to collect and publish artwork descriptions from Egypt's... more The MEKETREpository (MR) allows scholars to collect and publish artwork descriptions from Egypt's Middle Kingdom (MK) period on the Web. Collaboratively developed vocabularies can be used for the semantic classification and annotation of uploaded media. This allows all users with system access to contribute their knowledge about the published artworks. All data, including annotations and vocabularies, are published as Linked Data and can be accessed and reused by others.
Europeana is a single access point to millions of books, paintings, films, museum objects and arc... more Europeana is a single access point to millions of books, paintings, films, museum objects and archival records that have been digitized throughout Europe. The data. europeana. eu Linked Open Data pilot dataset contains open metadata on approximately 2.4 million texts, images, videos and sounds gathered by Europeana. All metadata are released under Creative Commons CC0 and therefore dedicated to the public domain.
With our YUMA Map Annotation Tool we allow scholars to annotate digitized historic maps. Besides ... more With our YUMA Map Annotation Tool we allow scholars to annotate digitized historic maps. Besides common annotation functionality it supports novel annotation features, such as semantic annotation augmentation and georeferencing. In this document, we briefly outline these features, the collections and users we are targeting, as well as the project background and organizational issues.
Abstract The World Wide Web has changed the way of publishing and distributing scholarly results.... more Abstract The World Wide Web has changed the way of publishing and distributing scholarly results. However, scholarly publications are still organized linearly and point to supplemental or related information only by textual references or at most by hyperlinks embedded into PDF documents. They are stored in closed repositories and we can hardly access, navigate, and use scholarly resources the way we do it with other Web resources.
Summary Cultural heritage institutions and private collections such as the Library of Congress or... more Summary Cultural heritage institutions and private collections such as the Library of Congress or the David Rumsey Map Collection are increasingly providing free online access to high-resolution scans of old maps. With the YUMA Map Annotation Tool, we want to facilitate collaborative scholarly annotation for such online resources.
In recent years, the Simple Knowledge Organization System (SKOS)[5] has emerged as the de-facto s... more In recent years, the Simple Knowledge Organization System (SKOS)[5] has emerged as the de-facto standard for expressing controlled vocabularies on the Web. Representative examples include AGROVOC1, EuroVoc2, GEMET3, and the STW4. With the adoption of the Web of Data idea and the Linked Data principles, the number of controlled vocabularies on the Web is growing and it becomes increasingly complex to manually assess their quality.
Abstract Interoperability is a qualitative property of computing infrastructures that denotes the... more Abstract Interoperability is a qualitative property of computing infrastructures that denotes the ability of sending and receiving systems to exchange and properly interpret information objects across system boundaries. Since this property is not given by default, the interoperability problem and the representation of semantics have been an active research topic for approximately four decades.
Cultural heritage institutions and private collections such as the Library of Congress or the Dav... more Cultural heritage institutions and private collections such as the Library of Congress or the David Rumsey Map Collection are increasingly providing free online access to high-resolution scans of old maps. With the YUMA Map Annotation Tool, we want to facilitate collaborative scholarly annotation for such online resources. A central feature of our tool is the integration of semantic linking into the annotation process: annotations are semi-automatically enriched with context information from sources on the Linked Data Web.
The dynamics of linked datasets may lead to broken links if data providers do not react to change... more The dynamics of linked datasets may lead to broken links if data providers do not react to changes appropriately. Such broken links denote interrupted navigational paths between resources and may lead to unavailability of data. As a possible solution, we developed DSNotify, an event-detection framework that informs actors about various types of changes and allows them to maintain links to resources in distributed linked data sets. For representing changes we developed the DSNotify Eventset Vocabulary.
Abstract Linked Data is a way of exposing and sharing data as resources on the Web and interlinki... more Abstract Linked Data is a way of exposing and sharing data as resources on the Web and interlinking them with semantically related resources. In the last three years significant amounts of data have been generated, increasingly forming a globally connected, distributed data space. For multimedia content, metadata are a key factor for efficient management, organization, and retrieval.
The Simple Knowledge Organization System (SKOS) is a standard model for controlled vocabularies o... more The Simple Knowledge Organization System (SKOS) is a standard model for controlled vocabularies on the Web. However, SKOS vocabularies often differ in terms of quality, which reduces their applicability across system boundaries. Here we investigate how we can support taxonomists in improving SKOS vocabularies by pointing out quality issues that go beyond the integrity constraints defined in the SKOS specification.
Abstract Many Web portals allow users to associate additional information with existing multimedi... more Abstract Many Web portals allow users to associate additional information with existing multimedia resources such as images, audio, and video. However, these portals are usually closed systems and user-generated annotations are almost always kept locked up and remain inaccessible to the Web of Data. We believe that an important step to take is the integration of multimedia annotations and the Linked Data principles.
Abstract This is the second paper in D-Lib Magazine about the ResourceSync effort conducted by th... more Abstract This is the second paper in D-Lib Magazine about the ResourceSync effort conducted by the National Information Standards Organization (NISO) and the Open Archives Initiative (OAI). The first part provided a perspective on the resource synchronization problem and introduced a template that organized possible components of a resource synchronization framework in a modular manner. This paper details a technical framework devised using that template.
Abstract. The rising popularity of RESTful Web services has recently motivated the extension of e... more Abstract. The rising popularity of RESTful Web services has recently motivated the extension of existing service orchestration engines to support the composition of services that do not rely on machine-readable descriptions. At the same time, within the Linking Open Data initiative, data sets are published conforming to the Linked Data principles, which can be naturally achieved by exposing RDF data through RESTful interfaces.
Abstract Web applications frequently leverage resources made available by remote web servers. As ... more Abstract Web applications frequently leverage resources made available by remote web servers. As resources are created, updated, deleted, or moved, these applications face challenges to remain in lockstep with changes on the server. Several approaches exist to help meet this challenge for use cases where" good enough" synchronization is acceptable. But when strict resource coverage or low synchronization latency is required, commonly accepted Web-based solutions remain illusive.
Expressing data in RDF is one of the principles to be considered when making data available as Li... more Expressing data in RDF is one of the principles to be considered when making data available as Linked Data on the Web. This can be achieved using RDF-wrappers for existing (relational) data stores or by using RDF stores as data repositories. The latter requires special RDF storage solutions, many of which are available today.
Project BRICKS aims to build a Europe-wide distributed Digital Library in the field of Cultural H... more Project BRICKS aims to build a Europe-wide distributed Digital Library in the field of Cultural Heritage. Each member organisation will run a node in the network (BRICKS node or BNode) and make its content available to the entire network. Content described in diverse Metadata standards can be searched with a unique query. Unlike other Digital Libraries, BRICKS is open and expandable, both on the organizational and the technical level.
Metadata in today's digital library systems are accessible through various incompatible interface... more Metadata in today's digital library systems are accessible through various incompatible interfaces and correspond to heterogeneous schemas. Clients that want to search over a number of distributed metadata sources require a solution that provides uniform and location transparent access to these systems without replicating the metadata stored therein. In this paper we describe a metadata integration approach that conceives these data sources as services in the sense of a service oriented architecture.
The MEKETREpository (MR) allows scholars to collect and publish artwork descriptions from Egypt's... more The MEKETREpository (MR) allows scholars to collect and publish artwork descriptions from Egypt's Middle Kingdom (MK) period on the Web. Collaboratively developed vocabularies can be used for the semantic classification and annotation of uploaded media. This allows all users with system access to contribute their knowledge about the published artworks. All data, including annotations and vocabularies, are published as Linked Data and can be accessed and reused by others.
Europeana is a single access point to millions of books, paintings, films, museum objects and arc... more Europeana is a single access point to millions of books, paintings, films, museum objects and archival records that have been digitized throughout Europe. The data. europeana. eu Linked Open Data pilot dataset contains open metadata on approximately 2.4 million texts, images, videos and sounds gathered by Europeana. All metadata are released under Creative Commons CC0 and therefore dedicated to the public domain.
With our YUMA Map Annotation Tool we allow scholars to annotate digitized historic maps. Besides ... more With our YUMA Map Annotation Tool we allow scholars to annotate digitized historic maps. Besides common annotation functionality it supports novel annotation features, such as semantic annotation augmentation and georeferencing. In this document, we briefly outline these features, the collections and users we are targeting, as well as the project background and organizational issues.
Abstract The World Wide Web has changed the way of publishing and distributing scholarly results.... more Abstract The World Wide Web has changed the way of publishing and distributing scholarly results. However, scholarly publications are still organized linearly and point to supplemental or related information only by textual references or at most by hyperlinks embedded into PDF documents. They are stored in closed repositories and we can hardly access, navigate, and use scholarly resources the way we do it with other Web resources.
Summary Cultural heritage institutions and private collections such as the Library of Congress or... more Summary Cultural heritage institutions and private collections such as the Library of Congress or the David Rumsey Map Collection are increasingly providing free online access to high-resolution scans of old maps. With the YUMA Map Annotation Tool, we want to facilitate collaborative scholarly annotation for such online resources.
In recent years, the Simple Knowledge Organization System (SKOS)[5] has emerged as the de-facto s... more In recent years, the Simple Knowledge Organization System (SKOS)[5] has emerged as the de-facto standard for expressing controlled vocabularies on the Web. Representative examples include AGROVOC1, EuroVoc2, GEMET3, and the STW4. With the adoption of the Web of Data idea and the Linked Data principles, the number of controlled vocabularies on the Web is growing and it becomes increasingly complex to manually assess their quality.
Abstract Interoperability is a qualitative property of computing infrastructures that denotes the... more Abstract Interoperability is a qualitative property of computing infrastructures that denotes the ability of sending and receiving systems to exchange and properly interpret information objects across system boundaries. Since this property is not given by default, the interoperability problem and the representation of semantics have been an active research topic for approximately four decades.
Cultural heritage institutions and private collections such as the Library of Congress or the Dav... more Cultural heritage institutions and private collections such as the Library of Congress or the David Rumsey Map Collection are increasingly providing free online access to high-resolution scans of old maps. With the YUMA Map Annotation Tool, we want to facilitate collaborative scholarly annotation for such online resources. A central feature of our tool is the integration of semantic linking into the annotation process: annotations are semi-automatically enriched with context information from sources on the Linked Data Web.
The dynamics of linked datasets may lead to broken links if data providers do not react to change... more The dynamics of linked datasets may lead to broken links if data providers do not react to changes appropriately. Such broken links denote interrupted navigational paths between resources and may lead to unavailability of data. As a possible solution, we developed DSNotify, an event-detection framework that informs actors about various types of changes and allows them to maintain links to resources in distributed linked data sets. For representing changes we developed the DSNotify Eventset Vocabulary.
Abstract Linked Data is a way of exposing and sharing data as resources on the Web and interlinki... more Abstract Linked Data is a way of exposing and sharing data as resources on the Web and interlinking them with semantically related resources. In the last three years significant amounts of data have been generated, increasingly forming a globally connected, distributed data space. For multimedia content, metadata are a key factor for efficient management, organization, and retrieval.
The Simple Knowledge Organization System (SKOS) is a standard model for controlled vocabularies o... more The Simple Knowledge Organization System (SKOS) is a standard model for controlled vocabularies on the Web. However, SKOS vocabularies often differ in terms of quality, which reduces their applicability across system boundaries. Here we investigate how we can support taxonomists in improving SKOS vocabularies by pointing out quality issues that go beyond the integrity constraints defined in the SKOS specification.
Abstract Many Web portals allow users to associate additional information with existing multimedi... more Abstract Many Web portals allow users to associate additional information with existing multimedia resources such as images, audio, and video. However, these portals are usually closed systems and user-generated annotations are almost always kept locked up and remain inaccessible to the Web of Data. We believe that an important step to take is the integration of multimedia annotations and the Linked Data principles.
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Papers by Bernhard Haslhofer