Keyphrases
- dependency relations
- semantic relations
- noun phrases
- natural language
- social media
- tree structure
- social networks
- natural language processing
- information retrieval
- information retrieval systems
- social networking
- digital libraries
- semantic roles
- online social networks
- domain specific
- wordnet
- parse tree
- keywords
- co occurrence
- index structure
- spanning tree
- document collections
- r tree
- semantic network
- text mining
- tree structures
- binary tree
- word pairs
- concept space
- topic detection
- hierarchical structure