Table of Contents
Automating the Web with WebL
History & Motivation
WebL = WebL Language
Talk Overview
Basic Inter-business Electronic-Commerce Premise
Characteristics: Hypertext vs. Distributed Database
Examples of (Distributed) Databases on the Web
Characteristics of Distributed Databases on the Web
Underlying Technology
But ...
Web Automation Challenges
WebL’s Approach
WebL’s Computation Model
Service Combinators [Cardelli 96]
Services & Combinators
Example I
Example II
Example III
Example IV
Example V
A Page Markup Algebra
Pieces - “regions in a page”
Unnamed Pieces - “text placeholders”
P1 and P2 Piece Comparisons
Piece Overlaps are Possible
Piece-sets
Piece-set Operators
Basic Operators: Union (+), Difference (-), Intersection (*)
Positional Operators: Indexing [ ], Before, After, ...
Hierarchical Operators Contain, Inside, Children, Parent, …
Piece-set Operator
Page Modification
Other Language Features
Example I - Page Validation
Example II - Stock Quote
Example III - News.com
Other applications we’ve built
Related Work
Current Status
Conclusion
Questions ?
Structured Text Search Comparison
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Author: Hannes Marais
Email: marais@pa.dec.com
Home Page: http://www.research.digital.com/SRC/personal/Johannes_Marais/home.html
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