Keyphrases
- textual content
- information retrieval
- document collections
- information retrieval systems
- document clustering
- web documents
- document retrieval
- xml documents
- relevant documents
- text documents
- keywords
- metadata
- database
- vector space model
- document classification
- application programming interface
- source code
- digital documents
- open source
- free text
- document representation
- relation extraction
- natural language text
- multi document summarization
- document analysis
- coreference resolution
- named entities
- electronic documents
- query expansion