Keyphrases
- language model
- document retrieval
- xml elements
- retrieval model
- language modeling
- test collection
- information retrieval
- xml retrieval
- ad hoc information retrieval
- language models for information retrieval
- n gram
- query expansion
- document ranking
- probabilistic model
- query terms
- document level
- document structure
- statistical language models
- document length
- language modelling
- smoothing methods
- text retrieval
- relevance model
- document representation
- xml documents
- retrieval effectiveness
- passage retrieval
- query specific
- pseudo relevance feedback
- database systems
- information retrieval systems
- document collections
- retrieval systems
- vector space model
- relevant documents
- digital libraries