Keyphrases
- metadata
- digital libraries
- controlled vocabulary
- information retrieval systems
- databases
- domain specific
- learning objects
- multimedia
- information resources
- scientific publications
- metadata management
- search terms
- database
- search interface
- information retrieval
- structured data
- query terms
- neural network
- digital content
- earth science
- knowledge base
- text mining
- natural language processing
- web services