Abstract
1. Introduction
2. The Unicorn Parsing System
3. Encountering an Unknown Lexeme
4. Hypothesis Management
4.1. Combining lower bounds
4.2. Combining upper bounds
5. The Implementation
5.1. An Example Learning Episode
5.2. Special cases
6. Formal foundations
6.1. Feature structures
6.2. Ordering feature structures
6.3. Combining information
7. Conclusion
References