Building linked data apps
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Presentation about how to use linked data in your iPhone app
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Building linked data apps
- 1. Building Linked Data Apps for the iPhone
- 7. 11/12 juni HTML Hackathon
- 10. Linked Open Data
- 12. 8-10-2007
- 13. 28-2-2008
- 14. 5-3-2009
- 15. 14-7-2009
- 18. Technology stack URI HTTP RDF, RDF/XML, RDF Schema RDFa GRDDL SPARQL
- 20. restaurant “ Ostermalmshallen” title
- 21. subject value property subject has a property with “ value ” (s,p,v)
- 22. id title description type 1 Ostermalmshallen A very nice... market ... ... ... ...
- 23. “ Ostermalmshallen” title “ A very nice ...” market description restaurant type
- 24. “ Ostermalmshallen” title “ A very nice ...” market description type restaurant owner Jurriens person name
- 25. RDF names things with URIs
- 26. < http://www.ostermalmshallen.se > “ Ostermalmshallen” < http://purl.org/dc/elements/1.1/title >
- 29. < http://www.ostermalmshallen.se > < http://purl.org/dc/elements/1.1/title > "Ostermalm Food Hall" . > "Ostermalm Food Hall" .
- 30. SPARQL
- 37. Good news
- 38. more
- 40. Technologies Objective C HTML iPhone SDK
- 41. REST
- 45. HTML 5
- 46. CSS3
- 47. Google Maps API
- 50. Lodsy
- 51. Concepts Facets
- 52. Architecture Lodsy LOD Triple store
- 55. Facets
- 56. Facet Name Property Type Title < http://purl.org/dc/elements/1.1/title > String Email < http://xmlns.com/foaf/0.1/mbox > Email ... ... ...
- 57. Views
- 58. rdfView
- 59. mapView
- 60. mapDetail
- 61. Demo
- 65. Future work
- 66. One more thing
- 68. Questions?
Notes de l'éditeur
- Hi everybody. So far I had a great time and I’m very proud to be here! I hope you are still interested after so many presentations in such a short time. I’m going to talk about Linked Data and how you can use it in your own iPhone applications. I developed a web service and client, called Lodsy, for accessing Linked Data more easily But first I’ll introduce my self.
- But who am I ? My name is Henk Jurriens
- I come from Holland and I live in Deventer, a small but very nice city.
- and I have one big passion : programming. A long time ago, it started with the famous Commodore VIC-20 Hacking Basic, playing
- Currently, I work for Profict and we’re mainly focused on JEE. But I’m also interested in other topics such as JVM languages, web frameworks. For example : Grails and Groovy, HTML 5 Groovy is a new dynamic language and looks like Java. Grails is a web framework and based on Groovy. You can be very productive with Grails!
- Talking about HTML 5, 11 and 12 june we’re going to organize the first Dutch HTML5 Hackathon. You’re welcome!
- Anyway if you want to know more about me... But let’s talk about Linked Data
- Where am I going to talk about? Explaining Linked Data What tools you can use for developing for iPhone Lodsy
- The goal of Linked Data is to extend the Web with data by publishing various open datasets as RDF links between data items from different data sources
- DBpedia - a dataset containing extracted data from Wikipedia; it contains about 2.18 million concepts described by 218 million triples, including abstracts in 11 different languages (see GeoNames provides RDF descriptions of more than 6,500,000 geographical features worldwide. FOAF - a dataset describing persons, their properties and relationships
- Circle size Triple count Very large >1B Large 1B-10M Medium 10M-500k Small 500k-10k Very small <10k Linked Data is growing very fast. Millions of triples
- Another definition of Linked Data
- Tim Berners Lee, inventor of the World Wide Web, published a set of principles for Linked Data 5. Just do it!
- The technology stack looks likes this. I’ll explain a few . Gleaning Resource Descriptions from Dialects of Languages. RDFa (or Resource Description Framework – in – attributes)
- In essence a simple data model It’s about writing down relations Motivation Web is a global, universal information space for documents Can we do same for data? RDF is the data format for that database
- a restaurant has a title ... and this is called a graph
- this is called a triple : (s, p, v)
- in a database table it looks likes this
- But of course a restaurant has more properties....
- and a restaurant has relations...
- a restaurant has a title ...
- different standards for describing resources Dublin Core is a standard for describing different kinds of resources
- Turtle or N3 RDF/XML
- Turtle RDF/XML
- - Pull values from structured and semi-structured data - Explore data by quering
- an example of a data set
- returns all triples with a property dc:title
- Google is harvesting rdf data Drupal and WordPress are using it for adding metadata to posts Amazon And Facebook!
- There are different technologies you can use for developing iPhone Apps such as ....
- SDK : main development tool, XCode, Interface Builder Objective C is the programming language for developing iPhone applications
- within an application you have different views. The 2 most important views - tableview - webView
- and this is an example of an webView and this is really nice! In this webView you can use HTML5
- I don’t go in detail about HTML5, but it has really nice features. And Robert did a great job by his presentation “Introduction to HTML5”. Especially the canvas-tag
- Also I’m using CSS3 for some nice animation
- Also I’m using google maps api for the maps
- There are many javascript libraries.. but iProcessing.js makes your live easier with drawing on the canvas
- For accessing Linked Data I created a Web service and a iPhone App using this service. First take a look at the architecture
- Lodsy is an application for exploring Linked Data. Exploring is based on concepts, for example a person, a restaurant These concepts can be filtered by facets
- Lodsy - web application offering services for the client, in this case a iPhone app LOD - Linked Open Data, Triple Store - triple store for storing triples iPhone - a client for consuming the Lodsy services
- Lodsy has the following services SPARQL is an endpoint for sparql queries.. Facets is a services for request facets.. later I’ll explain what facets are Views is a services for the visualization of triples
- Facet is a term from “Faceted Navigation” Faceted Navigation is a method of exploring your information by filtering on specific terms, a facet In our example, a facet is a property of a concept “Restaurant”
- Facets are mapped to a property of our triple. And a has also a type. This type can be used for different types input methods. Such as - text field - calendar field - etc
- restaurant
- Person
- facet