Keyphrases
- index terms
- query terms
- information retrieval
- document retrieval
- information retrieval systems
- retrieval systems
- structured documents
- controlled vocabulary
- document collections
- term frequency
- relevant documents
- test collection
- co occurrence
- keywords
- database
- document space
- retrieval model
- query expansion
- web documents
- image retrieval
- database systems
- journal articles
- related documents
- xml documents
- vector space model
- relevance feedback
- language model
- free text
- query processing
- knowledge discovery
- automatic indexing
- association rules
- text documents
- text classification