Ensure the security of your HCL environment by applying the Zero Trust princi...
Rapid Semantic Web Application Development
1. Rapid Semantic Web
Application Development
using Callimachus
Wednesday, September 14, 2011 1
Information overload, Impatient society, Change is the only constant
Software is not valued by its usefulness ... but by its expected future value
2. • Linked Data is about
publishing and consuming
data using international data
standards
• Based on 20 year old idea
• A system of linked
information systems
• Goal is to solve
organizational issues related
to data silos, requirements
for faster data integration
and the environment of
reduced IT budgets
Wednesday, September 14, 2011 2
Intro 3 Round Stones team, leaders in the international data integration standards published by the W3C ...
authors of peer-reviewed publications
Chairs of W3C working groups
Leaders in Open Source community
4. Problem Statement
We are curating LOTS of data today
Data model may change tomorrow
Guided curation helpful
Must be Web based
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We need a solution that will be up and running today. Downloadable from the Web for developers to use
immediately. Preferably Open Source to gain all the benefits that brings.
Something that handles the change we know we’ll have tomorrow
And ideally, deals with data quality & cleansing. Something that guides editors to collect and structure their data
5. Data Curation
Usual data management
concerns ...
Updating, correcting,
collecting, annotating,
publishing, categorizing
Promote data sharing
Data authority & provenance
are critical
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6. Possible Solutions
Roll your own three-tier
Content Management System
Wiki-based
Linked Data Management System
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A few different possible solutions to the three challenges stated earlier
7. Content Management Systems
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The big downside to 3 tier architecture is the upfront cost, as well as getting people to agree upfront on the
schema
So we then looked at CMS
These are systems that can be up and running the same day
8. Content Management System
Support collaboration & data sharing
Controls access
Provides easy storage
Reduces duplication
Improves report writing
Improves communication
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Everyone is familiar with the benefits of CMS, but let’s highlight them as context for the rest of this talk ...
9. Content Management System
Many features out of the box
Compile time extendable
Rigid data model, not agile
Change & customization is
expensive
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CMS has a significant reduced upfront cost
However, like 3 tier architecture, change and customization is expensive
General CMS do not quickly adapt to change
10. Wiki Software
Media Wiki
Semantic Media Wiki
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CMS are slow to adopt to change
So we then looked at Wiki Systems.
These are open ended, put whatever you want in them
11. Wiki Software
Collaboratively edit web pages
Transparency, linking, a low barrier to entry
Wikis focus is on unstructured content, ease of use
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12. Wiki Software
Many features out of the box
Easy to add new content data
Unstructured data
Blank page syndrome
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When presented with infinite choice, it's sometimes hard to get started
How do you ask multiple editors to provide particular information consistently?
13. Linked Data Management System
Callimachus (kəәlĭm'əәkəәs) is a framework for data-driven
applications based on Linked Data principles.
Callimachus allows Web authors to quickly and easily create
semantically-enabled Web applications.
Wednesday, September 14, 2011 13
Wiki Systems don't handle structured content well nor promulgate change well.
A tool for Web 2.0 developers creating DATA RICH web sites was needed …
We created Callimachus, a triples up & down solution (no mySQL under the covers). HIGHLY SCALABLE for real world use.
Named for the father of Bibliography (The Pinakes) at the Great Library of Alexandria. Lived during 305-c. 240 BCE.
He could not categorize his own work using Aristotle's hierarchical system. He was the first person who defined the use case for Linked
Data.
14. Linked Data Management System
Web 2.0 developers can create data driven application
with templates in hours
Triples up & down (no mySQL under the covers)
Wiki editing of content
Access control
Collaboration via Web
Change tracking (history)
Page/form Templates
Wednesday, September 14, 2011 14
Callimachus is a great way to collaboratively manage your Linked Data
Media Wiki is to free text what Callimachus is to linked data
Callimachus uses a straight forward ACL for linked data
18. Wednesday, September 14, 2011 18
This is an example of the view tab that took less than an hour to construct after loading 100M triples into a
database. It was an easy, fast way to begin to navigate the content and explore what we have -- this is all possible
because of the underlying data as RDF.
20. Wednesday, September 14, 2011 20
Callimachus allows us to visualize Google charts as pie charts, scatter plots, time series, bar charts, etc. It is easy
to show data on a map too.
26. Wednesday, September 14, 2011 26
A history of changes is kept. Note the change to the name and the added comment, along with the time/date
and name of the user who made the edit.
27. Wednesday, September 14, 2011 27
Selecting a TRI report will take you to information about a particular report. In this case, 3 pounds of lead was
released in 2010 by the Browns Ferry Nuclear Plant.
28. Wednesday, September 14, 2011 28
Selecting a substance name (e.g. from a TRI report) will take you to information about that substance. This data
comes from SRS.
29. Join the Community
Callimachus has benefited from 2+ years of corporate support
We’re using it for real world Web applications in environmental
protection, finance and healthcare
We’d love to work with the publishing industry
Open Source project
Visit callimachusproject.org
Join the discussion
Wednesday, September 14, 2011 29
