omg callimachus demo 20120322 small

David Wood3 Round Stones

[email protected]

callimachusproject.org

Copyright © 2011-12 3 Round Stones

3roundstones.com

Thursday, March 22, 12

An introduction to Callimachus for OMG’s Ontology PSIG, 22 March 2012, focusing on the use of Callimachus for the collaborative annotation of OWL ontologies.

carrelet@fr

plaice@en_gb sand dab@en_us

lemon dab@en_us

lemon sole@en_us

limande@fr

calimande@fr

plie@fr


Julia Child had a problem. Lack of governmental data standards hampered her work on her 1961 bestseller Mastering the Art of French Cooking. Names for fish varied between British & American English and French. Even Latin names differed. French and US governments were working on these problems themselves. The data was in silos.

1970s 1980s 1990s

$ cat foo.txt | grep blah | sort

A neat little package Client-Server The Early Web

Silos


Julia had her problem because her data was separated into silos. The history of computing is littered with silos.

Web

Universal Client

Universal Connection

Universal File System

Ubiquitous,reusable applications

URL Curation/

Proxy/Cache


The Web is very different. Documents and processes can link to each other: Facebook, twitter, Wordpress, Drupal, even Salesforce and Google Docs can break out of their silos via hyperlinks.


Our data is still in the dinosaur age. Traditional data is hierarchical, tabular with external schemas, and so are the systems that support them.Photo credit: David Wood, 2009

Web

Universal Client

Universal Connection

Universal Database

Logic and interlinking

Ubiquitous,reusable applications

URL Curation/

Proxy/Cache

of Data


By using the Web to interlink structured data, we can remove data silos like we removed file and process silos. We can make the Web into a database - a very large, distributed database - which will be as different from the RDBMS as early software is from the Web.


Mallard Web page, BBCData comes from DBpedia, WWF and other Linked Data sites. BBC curates data on the Web to ensure data quality. This is a fundamentally new business model for corporate data (and an indication of how far the EU/UK are in front of the US in this nascent market).


Each HTML page is paired with a machine-readable data representation.


Like a credit card, data served by Callimachus has two sides, a human-readable side and a machine-readable side. Linked Data in Callimachus is viewable in Web view presentable to humans and automatically accessible to machines for reuse.

Credit: Bradley P. Allen, Elsevier LabsThursday, March 22, 12

Emerging enterprise architectures are making use of Linked Data techniques. This example from Elsevier is typical of the genre.

LINKED DATAMANAGEMENT SYSTEM


Callimachus is a framework for data-driven applications based on Linked Data principles. It allows Web authors to quickly and easily create semantically-enabled Web applications, either using existing Linked Data or by creating Linked Data as you go.

CONTENTMANAGEMENT

SYSTEM

LINKED DATAMANAGEMENT

SYSTEM

Callimachus

UNSTRUCTURED

TEXT

TEXT

STRUCTURED

DATA

DATA


Callimachus, by contrast, manages primarily structured data. Linked Data makes statements about what we know; Angola has a population of 18.5 million people, we executed a trade for $200K, the Callimachus Project was founded in 2009. We use textual pages mostly to explain, navigate and visualize that data.


Callimachus is a Web application, and uses Web techniques throughout (HTTP, REST, HTML5, CSS, JavaScript). It implements core structured data standards from the W3C (RDF, SKOS, OWL).


Callimachus’ interface may be made nicer through a simple application of CSS.


The Callimachus psuedo file system is used to store and represent content, including RDF/OWL data, named SPARQL queries, schemata, templates...


For OMG, we loaded the USPS’s Publication 28 ontology into Callimachus.


Documents, including data and ontologies, can be uploaded via drag-and-drop when using an HTML5-compliant browser. File upload via a separate interface is available for older browsers.


By default, Callimachus generates an HTML view of a ontology or other RDF graph. This view is nearly at the triple level and is thus not as nice as we would like.


Attempting to resolve an omg.org URI will fail - Callimachus needs to be told that is should handle a foriegn URI. We do that by associating content types with Callimachus templates.


In most cases, Callimachus associates content URIs with templates via an OWL class. However, that gives us trouble when trying to visualize an OWL ontology: We don’t want to associate all owl:Class with a template!


We can avoid this problem by directly adding some triples. This small Turtle file associates a URI pattern for omg.org URIs with two Callimachus templates, one for viewing and the other for editing.

Templates

•Written in XHTML+RDFa (declarative pattern);

•Parsed to create SPARQL queries;

•Query results are filled into the same template.


Templates use RDFa hints


Edit templates are HTML forms



Using Callimachus templates, we can render ontological elements in any way we like. This one shows an rdfs:label, rdfs:comment, rdf:type and rdfs:subClass relationships. Other annotation terms can be added by writing HTML/RDFa into the associated view template.


The edit template allows us to change the RDF! Any fields can be edited. This template shows only rdfs:label and rdfs:comment being edited.


Named SPARQL queries are associated with a URI. This interactive map was created by a simple SPARQL query, which Callimachus converts to JSON to use as input into a Google Chart widget.


The named SPARQL query results that drive the map...


...and the SPARQL query itself.

[email protected]

@3RoundStones

David [email protected]

@prototypo


3 Round Stones produces Callimachus and offers support and licenses for enterprise versions. Please use Callimachus and contact us if we can help you.

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omg callimachus demo 20120322 small

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