PEN: A hierarchical document editor.
Todd AllenRobert P. NixAlan J. PerlisPublished in: ACM SIGPLAN Notices (1981)
Keyphrases
- document collections
- information retrieval systems
- topic hierarchy
- information retrieval
- web documents
- document retrieval
- document images
- retrieval systems
- document representation
- data mining
- document processing
- document structure
- document analysis
- vector space model
- document clustering
- hierarchical clustering
- hierarchical structure
- digital documents
- coarse to fine
- tf idf
- concept hierarchy
- structured documents
- hierarchical structures
- semantic information
- metadata
- document content
- hierarchically organized
- database