Abstract
In the spirit of Landin, we present a calculus of dependent types to serve as the semantic foundation for a family of languages called data description languages. Such languages, which include PADS, DATASCRIPT, and PACKETTYPES, are designed to facilitate programming with ad hoc data, i.e., data not in well-behaved relational or XML formats. In the calculus, each type describes the physical layout and semantic properties of a data source. In the semantics, we interpret types simultaneously as the in-memory representation of the data described and as parsers for the data source. The parsing functions are robust, automatically detecting and recording errors in the data stream without halting parsing. We show the parsers are type-correct, returning data whose type matches the simple-type interpretation of the specification. We also prove the parsers are "error-correct," accurately reporting the number of physical and semantic errors that occur in the returned data. We use the calculus to describe the features of various data description languages, and we discuss how we have used the calculus to improve PADS.
Original language | American English |
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Pages (from-to) | 2-15 |
Number of pages | 14 |
Journal | SIGPLAN Notices (ACM Special Interest Group on Programming Languages) |
Volume | 41 |
Issue number | 1 |
DOIs | |
State | Published - 2006 |
ASJC Scopus subject areas
- Software
- Computer Graphics and Computer-Aided Design
Keywords
- Data description language
- Dependent types
- Domain-specific languages