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Approach

1. accept 1 or more identifiers as input parameters
2. prepare an HTML GET or POST
3. create an org.daml.html.Tree object, which
   1. retrieves the HTML page resulting from the GET or POST
   2. uses the java.text.html package included in Sun's Java Development Kit to parse the resulting page. java.text.html accommodate HTML which is not well-formed (neither HTML or XHTML).
   3. builds a standard XML Document Object Model for the page (as if it were well-formed).
4. successively call org.daml.html.Tree.getString() with an XQuery queries to retrieve text within the document. getString current uses the Jaxen package to perform the queries.
5. create a Jena model containing corresponding DAML statements
6. return the serialized model to the user

Example

gateway	HTML site	ontology	implementation	sample
NYSE stock symbols	www.nyse.com	nyse-ont	nyse.java	http://www.daml.org/cgi-bin/nyse?VZ
Sabre travel itineraries	www.virtuallythere.com	itinerary-ont	virtuallythere.java	private
ZIP Codes	www.usps.com	zipcode-ont	zipcode.java	http://www.daml.org/cgi-bin/zipcode?48192
airports	www.ar-group.com	airport-ont	airport.java	http://www.daml.org/cgi-bin/airport?GEG

Downloads

Tree.java

implementation

Possible Future Directions

• build more gateways
• increase the degree of linkage between gateways
• greater support for portals involving multi-step dialogues and/or privacy considerations
• replace gateways as sites support DAML directly

Author