Presentation by Tim Hodson at the Talis Event 'The Web's Influence on Your Data' in London - 20th September 2011

1. Linked Data
Under the hood
Tim Hodson
Technical Consultant
@timhodson
#talisldod

2. Where do I
start?

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8. Simple Process
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9. Look at your data
http://www.flickr.com/photos/pss/4876189045/

10. What am I
looking for?

11. http://www.flickr.com/photos/striatic/729822

12. Simple Process
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13. Simple Process
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14. identifier

15. identifier
thing

16. identifier
thing

17. identifier
thing
1969-059A

18. identifier
thing
1969-059A
spacecraft/1969-059A

19. identifier
thing
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A

20. identifier
thing
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

21. identifier
28801.0kg
thing
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

22. identifier
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
thing
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

23. identifier
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
thing
United States
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

24. identifier
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
thing
United States
Cape Canaveral
1969-059A
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

25. identifier
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
thing
United States
Cape Canaveral
1969-059A
Saturn 5 spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

26. identifier
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
thing
United States
Cape Canaveral
1969-059A
Saturn 5 spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A

27. identifier

28. identifier
.../1969-059A

29. identifier
28801.0
mass .../1969-059A

30. identifier
Apollo 11 CSM
28801.0
name
mass .../1969-059A

31. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A

32. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A
launch
../launch:
1969-059

33. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A 16 July 1969
launch
date
../launch:
1969-059

34. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A 16 July 1969
launch
date
../launch:
1969-059
site
Cape
Canaveral

35. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A 16 July 1969
launch
date
../launch:
1969-059
site
Cape
Canaveral lat
N 28° 27' 31''

36. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A 16 July 1969
launch
date
../launch:
1969-059
site
Cape
Canaveral lat
N 28° 27' 31''
long
W 80° 31' 59''

37. identifier
Apollo 11 CSM Columbia
name
28801.0 name
mass .../1969-059A 16 July 1969
launch
date
../launch:
1969-059
<../1969-059A> mass 28801.0 .
<../1969-059A> name “Apollo 11 CSM” . site
<../1969-059A> name “Columbia” .
<../1969-059A> launch <../launch/1969-059> .
<../launch/1969-059> date 1969-07-16 . Cape
<../launch/1969-059> site <..site/capecanaveral> . Canaveral lat
<..site/capecanaveral> lat “N 28° 27' 31''” .
<..site/capecanaveral> long “W 80° 31' 59''” .
N 28° 27' 31''
long
W 80° 31' 59''

38. That all looks a
bit scary!

39. Simple format
An easy structure for capturing data

40. Simple format
An easy structure for capturing data
property
subject value

41. Simple format
An easy structure for capturing data
property
subject value
property
thing thing

42. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together

43. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A

44. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent

45. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B

46. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B
../person/B

47. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B
../person/B name

48. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B
../person/B name “Eric”

49. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B
../person/B name “Eric”

50. Simple format
An easy structure for capturing data
property
subject value
property
thing thing
Simple merging
An easy way to bung stuff together
../person/A hasParent ../person/B name “Eric”

51. RDF Triple
Merging

52. RDF Triple
Merging
The same identifier in a different
place is still the same thing

54. Simple Process
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56. Properties and Classes

57. Properties and Classes
Properties?

58. Properties and Classes
Properties?
Classes?

59. Properties and Classes
Properties?
they describe why something is linked
Classes?

60. Properties and Classes
Properties?
they describe why something is linked
Classes?
they group similarly typed things together

61. How do I know
what terms to
use?

62. Tools

63. Tools
• prefix.cc

64. Tools
• prefix.cc
- namespace lookup

65. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com

66. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com
- vocabulary search

67. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com
- vocabulary search
• sindice.com, ckan.net, LOD Diagram

68. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com
- vocabulary search
• sindice.com, ckan.net, LOD Diagram
- identify data sets to link with

69. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com
- vocabulary search
• sindice.com, ckan.net, LOD Diagram
- identify data sets to link with
• Kasabi Linked Data Marketplace

70. Tools
• prefix.cc
- namespace lookup
• schemapedia.com, schemacache.com
- vocabulary search
• sindice.com, ckan.net, LOD Diagram
- identify data sets to link with
• Kasabi Linked Data Marketplace
- access other data sources

71. Why don’t I
just use my own
terms for
things?

74. Add Value
Link to external sources

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77. Conversion

78. Conversion
• Database / spreadsheet export

79. Conversion
• Database / spreadsheet export
- Script/program convert

80. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites

81. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites
- URI matching

82. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites
- URI matching
- Linksets

83. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites
- URI matching
- Linksets
• Google Refine

84. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites
- URI matching
- Linksets
• Google Refine
- Facet analysis

85. Conversion
• Database / spreadsheet export
- Script/program convert
• Pull existing Linked Data from sites
- URI matching
- Linksets
• Google Refine
- Facet analysis
- Reconciliation API

86. What does my
data look like
now?

87. RDF Flavours
16 July 1969
date
../launch:
1969-059
Cape
Canaveral

88. RDF Flavours
• RDF/XML 16 July 1969
date
../launch:
1969-059
Cape
Canaveral

89. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
date
../launch:
1969-059
Cape
Canaveral

90. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
../launch:
1969-059
Cape
Canaveral

91. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
1969-059
Cape
Canaveral

92. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
• Turtle 1969-059
Cape
Canaveral

93. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
• Turtle 1969-059
Human readable
Cape
Canaveral

94. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
• Turtle 1969-059
Human readable
• RDFa Cape
Canaveral

95. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
• Turtle 1969-059
Human readable
• RDFa Cape
Html embedded Canaveral

96. RDF Flavours
• RDF/XML 16 July 1969
Machine to machine
• N-Triples date
Processing ../launch:
• Turtle 1969-059
Human readable
• RDFa Cape
Html embedded Canaveral
All valid RDF

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99. Put it on a web server
http://www.flickr.com/photos/traftery/4773457853

100. SPARQL

101. SPARQL
SPARQL RDF Query Language

102. SPARQL
SPARQL RDF Query Language
• Triple pattern matching

103. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
16 July 1969
date
../launch:
1969-059
Cape
Canaveral

104. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
16 July 1969
date
../launch:
1969-059
Cape
Canaveral

105. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle

106. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint

107. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store

108. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted

109. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted
- Hosted

110. SPARQL
SPARQL RDF Query Language
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted
- Hosted
- Managed Service - Talis

111. eh?

112. Linked Data Views

113. Linked Data Views
HTML based views of your data

114. Linked Data Views
HTML based views of your data
• Linked Data API

115. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia

116. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda

117. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views

118. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views
- Hand crafted webpages

119. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views
- Hand crafted webpages
• Backed by a Triple Store

120. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views
- Hand crafted webpages
• Backed by a Triple Store
- Local hosted

121. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views
- Hand crafted webpages
• Backed by a Triple Store
- Local hosted
- Hosted

122. Linked Data Views
HTML based views of your data
• Linked Data API
- Puelia
- Elda
• Bespoke Views
- Hand crafted webpages
• Backed by a Triple Store
- Local hosted
- Hosted
- Managed Service - Talis

126. Links

127. Links
Follow your nose

129. Links
Follow your nose

132. Is RDF the only
way to do Linked
Data?

134. Web Standards

135. But I just want
to let people use
my data.

136. http://www.flickr.com/photos/jwilde/3499946512

137. Accessing your Data
http://www.flickr.com/photos/jwilde/3499946512

138. Accessing your Data
Dat a API
http://www.flickr.com/photos/jwilde/3499946512

139. Accessing your Data
}
All have APIs
Dat a API
http://www.flickr.com/photos/jwilde/3499946512

140. Accessing your Data
}
All have APIs
All different!
Dat a API
http://www.flickr.com/photos/jwilde/3499946512

141. Summary
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no
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142. Summary
Na
Co
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ontology identifier SPARQL
RDF
property g
url resource mergin
model triple API

143. le
URI
DF
trip
R
http://www.flickr.com/photos/thienzieyung/5147954561

144. D F
R I
U R
rip le
t
http://www.flickr.com/photos/thienzieyung/5147954561

146. http://consulting.talis.com