From: Eli Barzilay <email@example.com> To: firstname.lastname@example.org, email@example.com Subject: [PLT announcement] PLT Scheme 209 available Date: Sat, 18 Dec 2004 00:32:29 -0500 PLT Scheme v209 is now available from http://download.plt-scheme.org/ * Several small errors in the ProfessorJ compiler have been corrected. Additionally, the native method interface has been updated to provide more access to class members by the native method. * The interfaces and implementations for several HtDP and HtDCH teachpacks have changed: + the World class for HtDCH now supplies ’draw’ and ’erase’ methods + its event callbacks are guaranteed to call erase before and draw after handling a tick or keyboard event + the world.ss teachpack provides a nw:rectangle function for creating rectangles whose pinhole is in the northwest corner. * Oleg Kiselyov’s SSAX/SXML is included in the distribution. The SSAX/SXML libraries provides functions for reading, writing and manipulating XML data. In addition, the package supports the definition of XML languages and exports machinery for transforming XML documents based on concise specifications. SSAX/SXML is the foundation for a variety of other XML packages in Scheme. For more information, see http://ssax.sourceforge.net/ and the documentation in the "ssax" collection. * Swindle is now included and maintained with PLT Scheme. Swindle is an extension of PLT Scheme. The main feature is a CLOS-like object system based on Tiny-CLOS from Xerox. Additional syntactic extensions include: :keyword values and optional CL-style argument lists; syntactic sugar for `define’s and `let’s; generic `set!’; `defsubst’ & `letsubst’ for defining simple macros, `letsyntax’, `letsubst’ and `letmacro’ than can bind identifier macros; a list-comprehension macro `list-of’ with an extensive generic version `collect’; an `echo’ mechanism for complex output formatting including list iterations; customizing printings via a `print-object’ generic; `amb’, adopted from Dorai’s TYSiFD, and more. Like Scheme in DrScheme, Swindle has several language levels. It is also possible to use its features on a selective basis. Those extensions that are not directly related to Tiny CLOS are likely to migrate into MzLib. Feebdack Weclome -- ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay: http://www.barzilay.org/ Maze is Life!