linked data under the hood
DESCRIPTION
Presented at the Talis Linked Data Open Day in San Francisco on 1st June 2011 by Richard WallisTRANSCRIPT
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Under the hoodRichard WallisTalis@rjw
Linked Data
#talisldod
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http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
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http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
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Identifying things
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Identifying things
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Identifying things
1969-059A
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Identifying things
spacecraft/1969-059A
1969-059A
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Identifying things
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
1969-059A
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Identifying things
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A
1969-059A
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Identifying things
spacecraft/1969-059A
nasa.dataincubator.org/spacecraft/1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A
1969-059A
with URIs
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Things have attributeshttp://nasa.dataincubator.org/spacecraft/1969-059A
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Things have attributeshttp://nasa.dataincubator.org/spacecraft/1969-059A
28801.0kg
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Things have attributeshttp://nasa.dataincubator.org/spacecraft/1969-059A
28801.0kg
Columbia
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Things have attributeshttp://nasa.dataincubator.org/spacecraft/1969-059A
28801.0kg
Columbia
Apollo 11 CSM
CSM-107
United States
Cape Canaveral
Saturn 5
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http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059Ahttp://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵mass
28801.0
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵mass
28801.0
Apollo 11 CSM⤵name
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵mass
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵⤵
mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launchhttp://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵⤵
mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵Cape
Canaveral
⤵mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
⤵site
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵Cape
Canaveral
⤵mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
⤵site
N 28° 27' 31''⤵lat
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵Cape
Canaveral
⤵mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
⤵site
N 28° 27' 31''
W 80° 31' 59''
⤵⤵lat
long
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵Cape
Canaveral
⤵mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
⤵site<../1969-059A> mass 28801.0 .<../1969-059A> name “Apollo 11 CSM” .<../1969-059A> name “Columbia” .<../1969-059A> launch <../launch/1969-059> .<../launch/1969-059> date 1969-07-16 .<../launch/1969-059> site <..site/capecanaveral> .<..site/capecanaveral> lat “N 28° 27' 31''” .<..site/capecanaveral> long “W 80° 31' 59''” .
N 28° 27' 31''
W 80° 31' 59''
⤵⤵lat
long
http://nasa.dataincubator.org/spacecraft/1969-059A
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.../1969-059A
⤵Cape
Canaveral
⤵mass
../launch:1969-059
28801.0
Apollo 11 CSM⤵ Columbia⤵name name
launch
16 July 1969⤵date
⤵site<../1969-059A> mass 28801.0 .<../1969-059A> name “Apollo 11 CSM” .<../1969-059A> name “Columbia” .<../1969-059A> launch <../launch/1969-059> .<../launch/1969-059> date 1969-07-16 .<../launch/1969-059> site <..site/capecanaveral> .<..site/capecanaveral> lat “N 28° 27' 31''” .<..site/capecanaveral> long “W 80° 31' 59''” .
RDF
N 28° 27' 31''
W 80° 31' 59''
⤵⤵lat
long
http://nasa.dataincubator.org/spacecraft/1969-059A
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RDF Triple
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RDF Triple
Thing attribute value
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RDF Triple
Thing valueproperty
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RDF Triple
Thing value
Thing property Thing
property
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RDF Triple
Thing value
Thing property Thing
property
../person/A
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RDF Triple
Thing value
Thing property Thing
property
../person/A hasParent
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RDF Triple
Thing value
Thing property Thing
property
../person/B../person/A hasParent
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RDF Triple
Thing value
Thing property Thing
property
../person/B
../person/B
../person/A hasParent
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RDF Triple
Thing value
Thing property Thing
property
../person/B
name../person/B
../person/A hasParent
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“Eric”
RDF Triple
Thing value
Thing property Thing
property
../person/B
name../person/B
../person/A hasParent
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“Eric”
RDF Triple
Thing value
Thing property Thing
property
../person/B
name../person/B
../person/A hasParent
Merging
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“Eric”
RDF Triple
Thing value
Thing property Thing
property
name../person/B../person/A hasParent
Merging
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RDF TripleMerging
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RDF TripleMerging
The same identifier in a different place is still the same thing
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A Property is a Thing too!
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A Property is a Thing too!
name
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A Property is a Thing too!
name
http://xmlns.com/foaf/0.1/name
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A Property is a Thing too!
name
foaf:name
http://xmlns.com/foaf/0.1/name
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A Property is a Thing too!
name
foaf:name
http://xmlns.com/foaf/0.1/name
“Eric”foaf:name../person/B
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http://www.flickr.com/photos/jwilde/3499946512
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
Data API
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
Data API}All have APIs
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
Data API}All have APIs
All different!
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
Data API}All have APIs
The key to access Linked Data
All different!
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http://www.flickr.com/photos/jwilde/3499946512
Opening up access to data
Data API}All have APIs
Web StandardsThe key to access
Linked Data
All different!
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Web Standards
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The power of the link
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The power of the link
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The power of the link
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The power of the link
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The power of the link
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The power of the link
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The power of the link
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The power of the link
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RDF in many forms
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RDF in many forms
• RDF/XML
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RDF in many forms
• RDF/XML Machine to machine
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RDF in many forms
• RDF/XML
• N-Triples
Machine to machine
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RDF in many forms
• RDF/XML
• N-Triples
Machine to machine
Processing
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RDF in many forms
• RDF/XML
• N-Triples
• Turtle
Machine to machine
Processing
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RDF in many forms
• RDF/XML
• N-Triples
• Turtle
Machine to machine
Processing
Human readable
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RDF in many forms
• RDF/XML
• N-Triples
• Turtle
• RDFa
Machine to machine
Processing
Human readable
![Page 75: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/75.jpg)
RDF in many forms
• RDF/XML
• N-Triples
• Turtle
• RDFa
Machine to machine
Processing
Human readable
Html embedded
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RDF in many forms
• RDF/XML
• N-Triples
• Turtle
• RDFa
Machine to machine
Processing
Human readable
Html embedded
All valid RDFCape Canaveral
../launch:1969-059
16 July 1969⤵date
⤵site
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RDF creation
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RDF creation
• Database / spreadsheet export
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RDF creation
• Database / spreadsheet export
- Script/program convert
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RDF creation
• Database / spreadsheet export
- Script/program convert
• Pull content from sites
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RDF creation
• Database / spreadsheet export
- Script/program convert
• Pull content from sites
- Content-negotiation to RDF/XML
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RDF creation
• Database / spreadsheet export
- Script/program convert
• Pull content from sites
- Content-negotiation to RDF/XML
• Google Refine
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RDF creation
• Database / spreadsheet export
- Script/program convert
• Pull content from sites
- Content-negotiation to RDF/XML
• Google Refine
- Facet analysis
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RDF creation
• Database / spreadsheet export
- Script/program convert
• Pull content from sites
- Content-negotiation to RDF/XML
• Google Refine
- Facet analysis
- Reconciliation API
![Page 85: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/85.jpg)
Modelling aids
![Page 86: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/86.jpg)
Modelling aids
• prefix.cc
![Page 87: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/87.jpg)
Modelling aids
• prefix.cc
- namespace lookup
![Page 88: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/88.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
![Page 89: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/89.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
- vocabulary search
![Page 90: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/90.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
- vocabulary search
• sindice.com ckan.net LOD Diagram
![Page 91: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/91.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
- vocabulary search
• sindice.com ckan.net LOD Diagram
- identify data sets to link with
![Page 92: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/92.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
- vocabulary search
• sindice.com ckan.net LOD Diagram
- identify data sets to link with
• Kasabi
![Page 93: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/93.jpg)
Modelling aids
• prefix.cc
- namespace lookup
• schemapedia.com
- vocabulary search
• sindice.com ckan.net LOD Diagram
- identify data sets to link with
• Kasabi
- Linked Data Marketplace
![Page 94: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/94.jpg)
The process
![Page 95: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/95.jpg)
The process
Model
![Page 96: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/96.jpg)
The process
NameModel
![Page 97: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/97.jpg)
The process
DescribeNameModel
![Page 98: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/98.jpg)
The process
ConvertDescribeNameModel
![Page 99: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/99.jpg)
Publish
The process
ConvertDescribeNameModel
![Page 100: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/100.jpg)
SPARQL
![Page 101: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/101.jpg)
RDF Query LanguageSPARQL
![Page 102: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/102.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
![Page 103: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/103.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
![Page 104: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/104.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
![Page 105: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/105.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
![Page 106: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/106.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted
![Page 107: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/107.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted
- Hosted
![Page 108: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/108.jpg)
RDF Query LanguageSPARQL
• Triple pattern matching
- uses Turtle
• Requires a SPARQL-endpoint
• Backed by a Triple Store
- Local hosted
- Hosted
- Managed Service - Talis
![Page 109: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/109.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
![Page 110: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/110.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs
![Page 111: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/111.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
![Page 112: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/112.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
![Page 113: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/113.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
![Page 114: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/114.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API
![Page 115: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/115.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API- Web Standards - http, RDF, ...
![Page 116: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/116.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API- Web Standards - http, RDF, ...
• Many open data/tools
![Page 117: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/117.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API- Web Standards - http, RDF, ...
• Many open data/tools
• Model➞Name➞Describe➞Convert➞Publish
![Page 118: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/118.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API- Web Standards - http, RDF, ...
• Many open data/tools
• Model➞Name➞Describe➞Convert➞Publish
• SPARQL endpoints for query
![Page 119: Linked Data Under the Hood](https://reader033.vdocuments.site/reader033/viewer/2022052619/5555d36dd8b42aaf158b4e26/html5/thumbnails/119.jpg)
http://www.flickr.com/photos/ferretsunlimited/499495786
Linked Data
Identifying Things with URIs• Things have attributes/properties
- Properties are Things too!
• URIs Merge - wherever
• Linked Data is the API- Web Standards - http, RDF, ...
• Many open data/tools
• Model➞Name➞Describe➞Convert➞Publish
• SPARQL endpoints for query
• Managed Hosting