Design of SigScheme
===================


Purposes
--------

  - Embedded into an application
  - Suitable for embedded platforms (i.e. non-desktop {OS,hardware})


Requirements
------------

  - 3-clause BSD license
  - Basic R5RS conformance
  - Small footprint
  - Low memory consumption
  - Highly modular and customizable
  - Code readability to enable learning Scheme by implementation
  - Easily extensible by C


Code organization
-----------------

  - Memory allocators
  - Exception and error handling
  - Storage Abstraction Layer
  - Continuation
  - Environment
  - Procedures and syntaxes
  - Reader
  - Writer
  - Multibyte character processing
  - Ports


Trade-offs
----------

  - Strict form validation
  - Multibyte string processing
  - Function aggregation to share prolog/epilog code fragment


API and ABI
-----------
  - ABI incompatibility between configurations
  - SAL and ABI
  - Dynamic link
  - Static link
  - Writing an extension by C