9. Metadata is Data
• Relationships are represented explicitly
• Schema can be represented as a graph
• Data integration is the union of two graphs
• This makes creating, extending, and
combining data much easier than before
11. • Semantics facilitate shared meaning through
• Subject Identity
• Strong and Consistent Semantics
• Open APIS + Open Data
• These principles make it much easier to
extend, combine, and integrate data
Why Does This Work?
12. What is Freebase?
• Structured Database
• Strong Collaboratively Edited Subjects
• Strong Collaboratively Developed
Semantics
• Open API + Open Data
53. <span xmlns:v="http://rdf.data-vocabulary.org/" typeof="v:Review">
<span rel="v:itemReviewed">
<span about="http://komalavilas.com" property="v:name"
typeof="v:Restaurant">KomalaVilas</span>
</span>
<span rel="v:reviewer">
<span about="http://rdf.freebase.com/ns/en.s_meenakshi_ammal"
property="v:name">Meenakshi Ammal</span>
</span>
<span property="v:rating" >3.7</span>
<span property="v:date">1st April 2005</span>
<span property="v:summary">
Best south Indian vegetarian food in the bay area</span>
</span>
An example of an RDFa Restaurant Review