Download to read offline
Uploaded byKristi Holmes
Linked Open Data_mlanet13
This document provides an introduction to the Semantic Web and Linked Open Data. It discusses how standards like RDF, XML, and OWL allow machines to better understand the meaning of data on the web. It describes how ontologies provide a vocabulary to define relationships between resources. The document outlines the benefits of publishing data as Linked Open Data using these standards, including making data more interoperable and accessible to both humans and machines. Examples are given of biomedical research projects that use Semantic Web technologies to integrate and link different types of data.
More Related Content
Similar to Linked Open Data_mlanet13
Linked Open Data_mlanet13
- 1. An Introduction tothe Semantic Web and Linked Open Data Kristi L. Holmes, PhD Twitter: @kristiholmes Layne Mark Johnson, PhD @LayneJohnson The day after May the Fourth, 2013
- 2.
- 3. We humans havealways applied tools to our work to make things work easier…
- 4.
- 5. “a web ofdata that can be processed directly and indirectly by machines” -Tim Berners-Lee
- 6. At its heart,the Semantic Web is really about extending standard Web technologies to better deal with data on the Web. If the WWW is for people, the Semantic Web is for machines George Thomas and Jim Hendler, http://www.data.gov/communities/node/116/blogs/142 Data modeled as bidirectional relationships Semantic Web Value Proposition… Web-based infrastructure of standards and technologies which allows for a distributable, machine readable description of data that allows for stronger data and smart web application linkages
- 7. How the SemanticWeb works Anakin Skywalker is Luke Skywalker's father.
- 8. How the SemanticWeb works XML and RDF are at the heart of the Semantic Web. They give computers a structure in which to look for information and define relationships between resources. http://computer.howstuffworks.com/semantic-web
- 9. An ontology issimply a vocabulary that describes objects and how they relate to one another. A schema is a method for organizing information http://computer.howstuffworks.com/semantic-web
- 10. Using languages designedfor data RDF | OWL | XML
- 11. Semantic web: describesmethods and technologies to allow machines to understand the meaning or "semantics” of information on the web. -- W3C director Sir Tim Berners-Lee Ontology: a formal representation of the knowledge by a set of concepts within a domain and the relationships between those concepts. -- Wikipedia
- 12. Let’s talk aboutthe data… The Semantic Web isn't just about putting data on the web. It is about making links, so that a person or machine can explore the web of data. With linked data, when you have some of it, you can find other related data. http://computer.howstuffworks.com/semantic-web
- 13. The 5 Starsof Linked Open Data ★ ★★ ★★★ ★★★★ ★★★★★ http://lab.linkeddata.deri.ie/2010/star-scheme-by-example/ http://www.w3.org/DesignIssues/LinkedData.html AVAILABILITY & VALUE
- 14. Is your data5-star?? The 5 Stars of Linked Open Data http://5stardata.info
- 15. The growth ofLinked Data 20082007 2011
- 16. http://lod-cloud.net What kind ofthings are available as linked data? The LOD Cloud
- 17. Models and standardsthat allow for greater data exchange (and flexibility!) It takes layers and layers of metadata, logic and security to make the Web machine- readable. http://computer.howstuffworks.com/semantic-web
- 18. Building a webof data http://geology.com/articles/night-satellite/satellite-photo-of-europe-at-night-lg.jpg Data Creators, Data Aggregators, & Data Consumers Repositories. Tools. Applications. Workflows
- 20. Ok! Now let’sdig into a few good examples of how we can put these things to work
- 21. Linked Open Dataand Biomedical Research: A Survey of Current International Efforts Kristi L. Holmes, PhD Twitter: @kristiholmes Layne Mark Johnson, PhD @LayneJohnson May 5, 2013
- 22.
- 23.
- 24. Research Networking Information aboutscholars is optimized using a Web-based infrastructure of standards and technologies which allows for a distributable, machine readable description of data that allows for stronger data and smart web application linkages across many universities, agencies, societies both within the US and abroad. Why is this important? Linked data infrastructure allows for • Visualizations, research and clinical data integration, and deep semantic searching across multiple types and sources of data • By breaking data out of traditional database silos, research networking platforms promote a network effect within a single site and across multiple sites – The value of the network increases with the amount of linked data and applications that are available to consume the linked data.
- 25. The Semantic Web &Researcher Networking • Increasing recognition of the value of semantic web standards • Increasing momentum in support of semantic web technologies to facilitate research discovery • Recommendations for researcher networking recently endorsed by the CTSA Consortium Steering Committee represent a new standard in researcher networking. • Examples of applications that consume these rich data include: visualizations, enhanced multi-site search. Other utilities are in development across a wide range of topic areas.
- 26. Recommendations and BestPractices for Research Networking The Research Networking Recommendations were approved by the CTSA Consortium Executive and Steering Committee on October 25, 2011. Recommendations for Research Networking: • Recommendation: All CTSAs should encourage their institution(s) to implement research networking tool(s) institution-wide that utilize RDF triples and an ontology compatible with the VIVO ontology. • Recommendation: Information in people profiles at institutions should be publicly available as data as a general principle, specifically as Linked Open Data. To ensure quality of information, authoritative electronic data sources versus manual entry should be emphasized. Institutions will vary in the amount of information that they will include and make publicly available but the value is enhanced by the quality and quantity of information. • Recommendation: Monitoring of the research networking landscape, technology, and tools should continue to be overseen by experts from the CTSA consortium (e.g., the Research Networking group of the Informatics KFC). https://www.ctsacentral.org/recommendations-and-best-practices-research-networking
- 27. Research Networking Systems •VIVO, Profiles, SciVal Experts, Stanford’s CAP, Iowa’s Loki • Encourage your RN provider to meet the recommendations for Researcher networking – Better visibility – Enhanced utility
- 28.
- 29. VIVO This work isfunded by the National Institutes of Health, U24 VIVO enjoys a robust open source, open community space to support implementation, adoption, and development efforts around the world. See http://vivo.sourceforge.net
- 30. www.ctsaconnect.org CTSAconnect Reveal Connections.Realize Potential. CTSAConnect Project Goals: – Identify potential collaborators, relevant resources, and expertise across scientific disciplines – Assemble translational teams of scientists to address specific research questions Approach: Create a semantic representation of clinician and basic science researcher expertise to enable – Broad and computable representation of translational expertise – Publication of expertise as Linked Data (LD) for use in other applications
- 31. 1/25/2015 31www.ctsaconnect.org CTSAconnect RevealConnections. Realize Potential. Merging VIVO and eagle-i eagle-i is an ontology-driven application for collecting and searching research resources. VIVO is an ontology-driven application for collecting and displaying information about people. Both publish Linked Data. Neither addresses clinical expertise. CTSAconnect will produce a single Integrated Semantic Framework, a modular collection of ontologies — that also includes clinical expertise eagle-i Resources VIV O People Coordination eagle-i VIV O Semantic Clinical activities
- 32. OpenPHACTS Open PHACTS Project •To reduce the barriers to drug discovery in industry, academia and for small businesses, the Open PHACTS consortium is building the Open PHACTS Discovery Platform. This will be freely available, integrating pharmacological data from a variety of information resources and providing tools and services to question this integrated data to support pharmacological research. Guiding principle is open access, open usage, open source - Key to standards adoption - http://www.openphacts.org/
- 33. OpenPHACTS Open PHACTS Project •Develop a set of robust standards… • Implement the standards in a semantic integration hub • Deliver services to support drug discovery programs in pharma and public domain • 22 partners, 8 pharmaceutical companies, 3 biotechs • 36 months project, through March 2014 Guiding principle is open access, open usage, open source - Key to standards adoption - http://www.openphacts.org/
- 34.
- 35. Outreach and adoption activities Education and training Ontology and controlled vocabulary expertise Relationships with vendors/data providers Programming & technical support Understanddata structure Libraries Libraries are supporting (& contributing!) to work areas in a variety of ways related to core mission and service areas
- 36. Tools & Apps. Search Visualizations Workefficiencies Analysis and evaluation
- 37. Search • VIVOsearch andCTSAsearch • VIVOsearchlight • AgriVIVO – FAO of the UN • Search across – Land Grant institutions – CTSA Consortium Schools – State university systems; Big 10, Big 12, etc.
- 38.
- 39.
- 40.
- 41.
- 42. Are you usingLinked Open Data? What are your hopes for this collection of technologies? How can you get involved?
- 43. Open data, opentools, open process Thank you! Acknowledgements: • Carlo Torniai & Melissa Haendel – OHSU • Tony Williams – OpenPHACTS, RSC • CTSA Research Networking Affinity workgroup • VIVO Project
Editor's Notes
- #5 My favorite tool…
- #6 Here were talking about different machines – computers. Describe typical web page, limitations of HTML Connecting documents, not concepts; not easy to traverse across disparate data sources From DERI (http://www.deri.ie/about/press/coverage/details/?uid=194&ref=214): The semantic web is a term coined by world wide web inventor and Deri advisory board member Tim Berners-Lee, to describe the “web of data” that enables machines to understand the semantics, or meaning, of information on the web. It involves the insertion of machine-readable metadata into web pages to give information on how they are related to each other, enabling automated agents to access the web more intelligently and perform tasks on behalf of users. Berners-Lee has defined the semantic web as “a web of data that can be processed directly and indirectly by machines”.
- #9 Anakin Skywalker is Luke Skywalker's father. It's easy for you to figure out what this sentence means -- Anakin and Luke Skywalker are both people, and there is a relationship between them. You know that a father is a type of parent, and that the sentence also means that Luke is Anakin's son. But a computer can't figure any of that out without help. To allow a computer to understand what this sentence means, you'd need to add machine-readable information that describes who Anakin and Luke are and what their relationship is. This starts with two tools -- eXtensible Markup Language (XML) and Resource Description Framework (RDF). XML is a markup language XML complements HTML by adding tags that describe data. These tags are invisible to the people who read the document but visible to computers. RDF does exactly what its name indicates -- using XML tags, it provides a framework to describe resources. In RDF terms, pretty much everything in the world is a resource. To do this, RDF uses triples written as XML tags to express this information as a graph. These triples consist of a subject, property and object, which are like the subject, verb and direct object of a sentence. (Some sources call these the subject, predicate and object.) So far in this example, the computer knows that there are two objects in this sentence and that there is a relationship between them. But it doesn't know what the objects are or how they relate to one another.
- #10 Another obstacle is that computers don't have the kind of vocabulary that people do. Difficult to know the connections between different words and concepts and to infer meanings based on contexts. In order to understand what words mean and what the relationships between words are, the computer has to have documents that describe all the words and logic to make the necessary connections. In the Semantic Web, this comes from schemata and ontologies.
- #11 From DERI (http://www.deri.ie/about/press/coverage/details/?uid=194&ref=214): The Semantic Web involves publishing in languages specifically designed for data: Resource Description Framework (RDF), Web Ontology Language (OWL), and Extensible Markup Language (XML). HTML describes documents and the links between them. RDF, OWL, and XML, by contrast, can describe arbitrary things such as people, meetings, or airplane parts.
- #12 Semantic/ontology definitions (below RDF), Elly in RDF example for visual, point out links. content from the VIVO team – http://vivoweb.org
- #14 Go to http://lab.linkeddata.deri.ie/2010/star-scheme-by-example/ (linked on arrow) and view data levels and examples – emphasize costs and benefits
- #15 ★ make your stuff available on the Web (whatever format) under an open license ★★ make it available as structured data (e.g., Excel instead of image scan of a table) ★★★ use non-proprietary formats (e.g., CSV instead of Excel) ★★★★ use URIs to identify things, so that people can point at your stuff ★★★★★ link your data to other data to provide context
- #17 What kind of things are available as linked data?
- #18 It takes layers and layers of metadata, logic and security to make the Web machine-readable. Most visual representations of these layers involve a stack -- sort of a tower of blocks that represent all the layers. The stack changes and evolves as the concepts behind the Semantic Web develop.
- #19 We want to use linked open data concepts to provide data as RDF at URIs. This is critically important for building a web of data. Predicates have addresses, sites point to objects in other triples stores. Resolve queries across triple stores – “show investigators who genetic work is implicated in breast cancer.” VIVO won’t have information linkages between breast cancer and disease. Other resources will. But VIVO can link to external sources. “Mike worksOn GeneY” Archives. Data Aggregators. Publishers. Institutional repositories. So now we turn to tools
- #23 This is a simplified version of the ecosystem of information we are creating. Additional elements not depicted are concepts and events.
- #30 VIVO enables collaboration and understanding across an institution and among institutions VIVO harvests much of its data automatically from verified sources so it is accurate and current, reducing the need for manual input. The rich information in VIVO profiles can be repurposed and shared with other institutional web pages and consumers, reducing cost and increasing efficiencies across the institution. Data is housed and maintained at the local institutions. There it can be updated on a regular basis. Search results are faceted so information can be located rapidly and with less time spent sorting through information. Profiles are largely created via automated data feeds, but can be customized to suit the needs of the individual. Profiles are richer in content than typical [web pages or] social networking sites and will rank higher in general internet searches. Across institutions VIVO provides a uniform semantic structure to enable a new class of tools using the data to advance science. …..visualizations, search, discovery, etc Each institution provides its own VIVO system and data. Local governance determines data to be provided. VIVO structures data in RDF triples using the VIVO ontology. Moreover, the recommendations state that as a general principle the profile data should be publically available as Linked Open Data. This announcement demonstrates the CTSA Consortium’s recognition of the value of semantic web standards and increasing momentum in support of semantic web technologies to facilitate research discovery. Examples of applications which consume these rich data, including: visualizations (Katy’s viz URL), enhanced multi-site search (VIVO search URL), and VIVO Searchlight (searchlight URL). Other utilities are in development across a wide range of functionalities.
- #37 Strong open source development component to the project – this is reflected in part by the top notch applications that were submitted to a recent call for applications by the project
- #41 Data are reused and repurposed in a wide array of tools and settings. Cornell University has done a stellar job of this – using VIVO data to provide current information about faculty and their interests for department and college websites; University of Florida reuses data from their VIVO for their CTSI member database – a move that other institutions are making, as well.