Update SPPSV-padl05.md

We adopt a light-weighted approach, introducing a notion of restricted form of dependent
types, where we clearly separate type index expressions from run-time expressions.
In functional programming, we have enriched the type system of ML with such
a form of dependent types, leading to the design of a functional programming language
DML (Dependent ML) [Xi98,XP99].In imperative programming, we have designed a
programming language Xanadu with C-like syntax to support such a form of dependent
types. 


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