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Finding Data, Knowledge, and Answers on the Semantic Web

2007-02-14

Web search engines like Google have made us all smarter by providing ready access to the world's knowledge whenever we need to look up a fact, learn about a topic or evaluate opinions. The W3C's Semantic Web effort aims to make such knowledge more accessible to computer programs by publishing it in machine understandable form. As the volume of Semantic Web data grows, software agents will need their own search engines to help them find the relevant and trustworthy knowledge they need to perfo...

Characterizing the Semantic Web on the Web

2006-11-05

Semantic Web languages are being used to represent, encode and exchange semantic data in many contexts beyond the Web -- in databases, multiagent systems, mobile computing, and ad hoc networking environments. The core paradigm, however, remains what we call the {em Web aspect} of the Semantic Web -- its use by independent and distributed agents who publish and consume data on the World Wide Web. To better understand this central use case, we have harvested and analyzed a collection of...

Information Integration and the Semantic Web

2006-10-26

This short position paper describes the role that the Semantic Web can play in information integration and how the Swoogle Semantic Web search engine can help.

Using the Semantic Web to Support Ecoinformatics

2006-10-13

We describe our on-going work in using the semantic web in support of ecological informatics, and demonstrate a distributed platform for constructing end-to-end use cases. Specifically, we describe ELVIS (the Ecosystem Location Visualization and Information System), a suite of tools for constructing food webs for a given location, and Triple Shop, a SPARQL query interface which allows scientists to semi-automatically construct distributed datasets relevant to the queries they want to a...

Swoogle's Metadata about the Semantic Web

2006-05-30

Semantic Web technology enables us to specify metadata about things in the world; however, the metadata of the Semantic Web on the Web is also important for accessing online Semantic Web data. In this paper, we show how Swoogle collects the metadata from Semantic Web document to build a global picture of the Semantic Web. We also show the database schema that stores the metadata, and use an example Semantic Web document to explain how the metadata has been extracted and stored.

Integrating Ecoinformatics Resources on the Semantic Web

2006-05-20

We describe ELVIS (the Ecosystem Location Visualization and Information System), a suite of tools for constructing food webs for a given location. We express both ELVIS input and output data in OWL, thereby enabling its integration with other semantic web resources. In particular, we describe using a Triple Shop application to answer SPARQL queries from a collection of semantic web documents. This is an end-to-end case study for the semantic web�'s utility for ecological and environmen...

Enhancing Semantic Web Data Access

2006-04-06

The Semantic Web was invented by Tim Berners-Lee in 1998 as a web of data for machine consumption. Its applicability in supporting real world applications on the World Wide Web, however, remains unclear to this day because most existing works treat the Semantic Web as one universal RDF graph and ignore the Web aspect. In fact, the Semantic Web is distributed on the Web as a web of belief: each piece of Semantic Web data is independently published on the Web as a certain agent's belief instead...

Social Networking on the Semantic Web

2005-12-31

The Semantic Web promised to enable a new generation of intelligent applications by providing programs and software agents with rich and effective ways to share information and knowledge. The Semantic Web allows people and groups to define sharable ontologies - collections of classes, properties and objects - with well defined and unambiguous meaning. These ontologies permits computer programs to read, publish and exchange information and knowledge, enhancing interoperability, cooperation, an...

Finding and Ranking Knowledge on the Semantic Web

2005-11-07

Swoogle is a system that helps knowledge engineers and software agents find knowledge on the web encoded in the semantic web languages RDF and OWL. Based on the search mechanisms provided in the previous version, we propose a novel semantic web navigation model and refine mechanisms for ranking the semantic web at various granularities. Although the semantic web is materialized on the Web, it is hard to navigate within the semantic web since few explicit ``hyperlinks'' are available besides ...

Tracking RDF Graph Provenance using RDF Molecules

2005-11-07

Tracking the provenance of an RDF graph requires finding all supporting sources and rejecting all irrelevant ones, but neither RDF document nor triple is appropriate. Therefore, we approach this goal using lossless decomposition of RDF graph at RDF molecule granularity, which is the finest and lossless sub-graph of an RDF graph. We also implements three decomposition strategies a prototype RDF graph provenance service covering 50M real world triples collected by Swoogle.

Search on the Semantic Web

2005-10-01

To help human users and software agents find relevant knowledge on the Semantic Web, the Swoogle search engine discovers, indexes, and analyzes the ontologies and facts that are encoded in Semantic Web documents.

Search on the Semantic Web

2005-09-01

The Semantic Web provides a way to encode information and knowledge on web pages in a form that is easier for computers to understand and process. This article discusses the issues underlying the discovery, indexing and search over web documents that contain semantic web markup. Unlike conventional Web search engines, which use information retrieval techniques designed for documents of unstructured text, Semantic Web search engines must handle documents comprised of semi-structured data. Mo...

Swoogle: Searching for knowledge on the Semantic Web

2005-07-19

Swoogle is an implemented system that discovers, analyzes and indexes knowledge encoded in semantic web documents on the Web. Swoogle reasons about these documents and their constituent parts (e.g., terms and triples) and records meaningful metadata about them. Swoogle provides webscale semantic web data access service, which helps human users and software systems to find relevant documents, terms and triples, via its search and navigation services. Swoogle also provides a customizabl...

How the Semantic Web is Being Used:An Analysis of FOAF Documents

2005-01-03

Semantic Web researchers have initially focused on the representation, development and use of ontologies but paid less attention to the social and structural relationships involved. The past year has seen a dramatic increase in the amount of published RDF documents using the Friend of a Friend (FOAF) vocabulary, providing a valuable resource for investigating how early Semantic Web adopters use this technology as well as build social networks. We describe an approach to identify, disc...

Information Retrieval and the Semantic Web

2005-01-03

Information retrieval technology has been central to the success of the Web. For semantic web documents or annotations to have an impact, they will have to be compatible with IR technology. We discuss three approaches to using conventional IR systems with documents and annotations in semantic web languages. Each has been implemented. Conference on System Sciences

Swoogle: A Search and Metadata Engine for the Semantic Web

2004-11-09

Swoogle is a crawler-based indexing and retrieval system for the Semantic Web. It extracts metadata for each discovered document, and computes relations between documents. Discovered documents are also indexed by an information retrieval system which can use either character N-Gram or URIrefs as keywords to find relevant documents and to compute the similarity among a set of documents. One of the interesting properties we compute is textit {ontology rank}, a measure of the impo...

10M RDF triples

2005-06-16

A colleague has been testing the scalablilty of a triple store using synthetic triples. He asked if we could package up a large collection of real tiples caught in the wild by Swoogle. After talking a bit, it was decided that having them as a simple SQL database dump would be the most convenient form. This SQL database dump contains a table that of about 10.4M RDF triples extracted from the Swoogle cache on June 15, 2005. The size of the compressed file is 162M and when uncompressed its...

Finding knowledge, data and answers on the Semantic Web

2006-07-17

Web search engines like Google have made us all smarter by providing ready access to the world's knowledge whenever we need to look up a fact, learn about a topic or evaluate opinions. The W3C's Semantic Web effort aims to make such knowledge more accessible to computer programs by publishing it in machine understandable form. As the volume of Semantic Web data grows software agents will need their own search engines to help them find the relevant and trustworthy knowledge they need to per...

Finding knowledge, data and answers on the Semantic Web

2006-10-08

Web search engines like Google have made us all smarter by providing ready access to the world's knowledge whenever we need to look up a fact, learn about a topic or evaluate opinions. The W3C's Semantic Web effort aims to make such knowledge more accessible to computer programs by publishing it in machine understandable form. As the volume of Semantic Web data grows software agents will need their own search engines to help them find the relevant and trustworthy knowledge they need to per...

Finding knowledge, data and answers on the Semantic Web

2007-05-09

Information Integration and the Semantic Web

2006-10-26

This presentsation from the Information Integration Workshop describes the role that the Semantic Web can play in information integration and how the Swoogle Semantic Web search engine can help. Examples from the NSF Spire project on ecoinformatics are used.

Information Integration and the Semantic Web -- Finding knowledge, data and answers

2006-10-26

Most common RDF namespaces

2006-08-22

Here's some data we collected from Swoogle on 22 August 2006 for Frederick Giasson's Ping the Semantic Web project. This table shows the 100 most common namespaces measured by the number of Semantic Web Documents (SWDs) that use them. For each one, we give the most common abbreviation, the percent of SWDs using the name space that use the most common abbreviation, and the number of SWDs using the namespace as an absolute number and as a percent of all SWDs.

Swoogle poster (June 07)

2007-06-01

Swoogle is a crawler-based indexing and retrieval system for Semantic Web Documents (SWDs), that is, web documents written in RDF or OWL. Swoogle discovers, digests, analyzes and indexes online SWDs and provide query and report service through a web interface.

Swoogle Poster (ppt) (may 2004)

2004-05-21

Swoogle poster prepared for the May 2004 DAML PI meeting.

Swoogle Poster PDF (May 2004)

2004-05-21

Swoogle poster prepared for the May 2004 DAML PI meeting. (PDF)

Swoogle Presentation (Nov, 04,CIKM)

2004-11-12

Swoogle-tutorial-1 (Jan 11)

2005-01-11

This is tutorial for Swoogle users. It explains the motivation, overviews Swoogle research issues, and demonstrates how to use Swoogle.

swoogle31_urls_2006-JAN

2006-01-14

A dump of a subset of semantic web urls indexed by swoogle 3.1 as of Jan 2006.

Predicting Appropriate Semantic Web Terms from Words

2008-02-26

The Semantic Web language RDF was designed to unambiguously define and use ontologies to encode data and knowledge on the Web. Many people find it difficult, however, to write complex RDF statements and queries because doing so requires familiarity with the appropriate ontologies and the terms they define. We describe a system that suggests appropriate RDF terms given semantically related English words and general domain and context information. We use the Swoogle Semantic Web search engine t...

Finding knowledge, data and answers on the Semantic Web

2006-07-17

Web search engines like Google have made us all smarter by providing ready access to the world's knowledge whenever we need to look up a fact, learn about a topic or evaluate opinions. The W3C's Semantic Web effort aims to make such knowledge more accessible to computer programs by publishing it in machine understandable form. As the volume of Semantic Web data grows software agents will need their own search engines to help them find the relevant and trustworthy knowledge they need to per...

Enhancing Semantic Web Data Access

2006-04-06

The Semantic Web is coined by Tim Berners-Lee in 1998 as a web of data for machine consumption. Its applicability in supporting real world applications on the World Wide Web, however, remains unclear to this day mainly because its Web aspect has been neglected in past research. Most existing works usually model the Semantic Web as one universal RDF graph, and they either ignore the storage layer or investigate ad hoc storage layers (e.g. databases and peer-to-peer systems) other than t...

PhD proposal: On Boosting Semantic Web Data Access

2005-01-19

The Semantic Web can be viewed as a collection of RDF graphs serialized by RDF documents that distributed in the Web. Its utility depends on three issues: availability (existence of data), accessibility (users can retrieve the data they want), and quality (users can judge the quality of the retrieved data). While more data are available in the Semantic Web, the latter two issues are often ignored or circumscribed due to lacking of tools and mechanisms. This dissertation proposes an ontology-b...

Joel Sachs on Linked Data, 10:30am Oct 1, ITE 325b

2007-09-27

I thought I would start blogging about our weekly ebiquity meetings, at least for those that might be of interest to people outside of our group. Our meetings are, in general, open and we are happy to have visitors, with or without warning. We meet on Monday mornings, from 10:30 to 11:30 or Noon, depending on the topic, in our department’s large conference room (325b ITE Building). This coming week (October 1) Joel Sachs will give us a tutorial on Linked Data. Here’s his abstr...

Is my document indexed by Swoogle?

2006-02-06

"Swoogle has indexed millions of Semantic Web Documents, but how do I know that mine has been indexed?" Here is a simple way - please try your URL using Swoogle Track Back Service. Here I list several example to show how it works: It helps us track the evolution of an ontology - say the protégé ontology http://protege.stanford.edu/plugins/owl/protege -------------------------------------------------------------------------------- About this URL The latest ping on [2006-01-29]...

Well, Is my document indexed by Swoogle or not?!

2006-02-06

Yesterday we posted directions on how to tell if your Semantic Web document is in Swoogle's database. Unfortunately, our directions suggested using a service that, if called outside our firewall, requires a Swoogle API key. (This is seperate from being a registered Swoogle user.) We didn't notice at first, because we were inside the firewall when we tested it. When we did, we deleted the post, but PlanetRDF had already picked up the post and it was still in our database. We're working t...

Swoogle: over 1,000,000 Semantic Web documents

2006-02-06

Sometime today the UMBC Swoogle Semantic Web search engine discovered and indexed its millionth document. Of these, about 77% are valid RDF documents, 15% HTML documents with embedded RDF and 8% appear to be RDF documents but can not be parsed.

Fininding foaf instances

2006-02-04

Foaf is a well-known semantic web practice on the Web, and we know that there are millions of FOAF instances on the Web. A scutter can help use to recursively find foaf documents online using hyperlinks in foaf documents; however, how to obtain the initial seeds is still a big issue. In addition, many semantic web users would like to find out the population of ontology, e.g. the instances of a defined class such as foaf:Person, or where foaf:email...

Half of Swoogle's hits are from referer log spammers

2006-02-04

We are using bbclone to generate reports on Swoogle access. Look at today's top 10 referers as of 3:00pm: www.legaladvocate.net 246 26.14% www.myjavaserver.com 152 16.15% www.google.com 125 13.28% dannyayers.com 44 4.68% lucky7.to 34 3.61% ebiquity.umbc.edu 25 2.66% www.google.de 18 1.91% planetrdf.com 18 1.91% mail.google.com 18 1.91% groups.google.com ...

Swoogle, Groundhog Day edition

2006-02-02

If you go to Swoogle on this Groundhog's Day you will see a change. We've released a new version, Swoogle 2006, that is a nearly complete rewrite of Swoogle Classic, which now answers to Swoogle 2005. While Swoogle is currently missing some of Swoogle 2005's features, it enjoys a cleaner and simpler model and foundation. We will be adding in some of these features as well as new ones over the next few months. Here are some of Swoogle 2006's highlights: New hardware. Swoogle 2006 i...

Swooglers group for Swoogle users

2006-02-02

We've set up a Google group, Swooglers, for users of the Swoogle Semantic Web search engine. Anyone can browse the archived and join, but only members can post messages. Replies are sent to the whole group. We're not exactly sure what Swooglers will have to talk about, but it might be a place to share your experiences in using Swoogle, ask other users for advice, etc.

Large RDF and OWL documents on the Semantic Web

2006-01-26

Recently Cláudio Fernandes asked on several semantic web mailing lists "Can someone point me to some huge owl/rdf files? I'm writing a owl parser with different tools, and I'd like to benchmark them all with some really really big files." I just ran some queries over Swoogle's collection of 850K RDF documents collected from the web. Here are the 100 largest RDF documents and OWL documents, respectively. Document size was measured in terms of the number of triples. For this query, a...

SemNews: NLP system generates Semantic Web representation of news summaries

2006-01-12

SemNews is a prototype application being developed by UMBC Ph.D. student Akshay Java that uses a sophisticated text understanding system to interpret summaries of news stories, publishes the results on the semantic web and provides browsing and query services over them. The project is the result of a collaboration between the UMBC's Institute for Language and Information Technologies and Ebiquity Laboratory with partial support from the Lockheed Martin Corporation. SemNews monitors a numb...

RDF molecules and lossless decompositions of RDF graphs

2005-07-31

Some RDF graphs can be viewed as making assertions about the world. Suppose you were given a graph, G, and asked to find supporting evidence on the web. One approach is to search for documents with RDF graphs containing G as a sub-graph, adhering to RDF's semantics for blank nodes and maybe applying some RDFS and OWL semantics. Even after doing that, few or maybe no RDF documents may contain *all* of G as a subgraph. Another approach is to decompose G into its constituent triples and...

Stress test your RDF triple store

2005-06-16

A colleague has been testing the scalablilty of a triple store using synthetic triples. He asked if we could package up a large collection of real triples caught in the wild by Swoogle. After talking a bit, it was decided that having them as a simple SQL database dump would be the most convenient form. 10M Triples is an SQL database dump containing a table that of about 10.4M RDF triples extracted from the Swoogle cache on June 15, 2005. The size of the compressed file is 162M and when ...

Nature red in tooth and claw

2005-05-13

Two of our AIX boxes were compromised this week, including the machine that runs most of Swoogle's services. So, Swoogle and a few of our other research systems will be off line until sometime next week. We're reorganizing our systems and putting more of them behind the campus firewall, leaving only the interfaces outside the firewall. This isn't the first time we've had such incidents and it won't be the last. I'm resigned that it will just be this way until the end of time -- a constant...

Finding RDF instance data with Swoogle

2005-04-24

Someone on the yahoo semanticWeb mailing list asked for "a populated ontology for countries". I thought "Ha! This is just what Swoogle is designed for -- finding RDF documents". It turned out to not be as easy as I expected, prompting us to add a new feature. You can now use Swoogle to find RDF documents instantiating a given class or property. The results will be ranked them by the number of instances. So, here are a two ways to find populated country ontologies. The first approac...

Swoogle and Swangling demonstration

2005-04-07

We will demonstrate Swoogle and Swangling at the 2005 Semantic Web for National Security (SWANS) conference. The concepts and features to be demostrated are all in the Swoogle tour. You can also see the Swoogle poster and the swangling poster that we will use.

Swoogle cheat sheet

2005-03-03

The Swoogle Cheat Sheet is a concise summary of Swoogle's search synyax -- i.e., what you can type into Swoogle's search box and what it does.

Swoogle Firefox Search Plugin

2005-03-02

You can now add a Swoogle search plugin for Firefox. Open this link and Firefox and it should automatically install the plugin in your browser. See here for more information.

Swoogle's cheat sheet

2005-02-23

Swoogle's Cheat Sheet has just been added to our Swoogle website. It's a list of syntaxes you can use with Swoogle's search engine, along with some other interesting services, such as Ontology Dictionary, Swoogle Statistics, and Swoogle's RDF Site Map. This cheat sheet could be printed in two pages, but the orientation has to be landscape. Here are something that you may be unfamiliar with: [..] in vocabulary search: Search "[cat]" for all terms of "cat";search &quo...

Swoogle namespace searches

2005-02-15

We've added a new feature to Swoogle's web interface that allows one to search for RDF documents that use a particular namespace. To use this, include a search term of the form ns: where is either a URI for the namespace or an abbreviation for one of the most common namespaces. This example query searches for all RDF documents that use the cobra namespace (ns:http://daml.umbc.edu/ontologies/cobra/0.4/). A second example (i.e. pet person ns:foaf) finds RDF documents ...

FOAF dataset available

2005-01-25

We've published a foaf dataset extracted from FOAF files collected during the Fall of 2004 from our work on Swoogle. The data represents 7118 foaf documents collected from 2044 sites (identified by their symbolic IP address). A total of 201,612 RDF triples with provenance information are included. The foaf files were selected from larger datasets described in several recent papers (1, 2) to represents a interesting and balanced selection of foaf documents. This dataset is distributed under th...

On finding semantic web documents

2005-01-14

After looking at the piece on Peter Norvig's views on the semantic web (Semantic Web Ontologies: What Works and What Doesn't), I realized that he's talking about a request we made when we started developing Swoogle: "A friend of mine just asked can I send him all the URLs on the web that have dot-RDF, dot-OWL, and a couple other extensions on them; he couldn't find them all. I looked, and it turns out there's only around 200,000 of them. That's about 0.005% of the web. We've got a ways to go....

Swoogle is dead, long live Swoogle

2004-12-09

Swoogle is off line for a day or two. We discovered that our Swoogle server (pear) was compromised. (Yet another PHP-Nuke vulnerability.) We have a plan to bring it back up in a more secure configuration with the database behind a firewall and only the web interface exposed to the elements. A consequence is that only the official URL, HTTP://SWOOGLE.UMBC.EDU/, will work. It's a jungle out there.