X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;ds=sidebyside;f=helm%2Fwww%2Flambdadelta%2Fweb%2Fhome%2Fimplementation.ldw.xml;h=229c5e88b45471517ff70ea0dcaf9f847e68fe34;hb=f7d7f2459b3b0409be5f168822be3b836ccc929b;hp=ef29ccc0fe81ce0832123538ee6d745b7f5907c9;hpb=3bd760474c12a1c527e24ac7ed39412d994e2db5;p=helm.git diff --git a/helm/www/lambdadelta/web/home/implementation.ldw.xml b/helm/www/lambdadelta/web/home/implementation.ldw.xml index ef29ccc0f..229c5e88b 100644 --- a/helm/www/lambdadelta/web/home/implementation.ldw.xml +++ b/helm/www/lambdadelta/web/home/implementation.ldw.xml @@ -3,7 +3,7 @@ @@ -12,7 +12,7 @@ λδ Digital Library (LDDL) The λδ Digital Library is part of HELM - and contains resources expressed in λδ. + and contains resources expressed in the systems of the λδ family. @@ -33,11 +33,12 @@ Helena + - Helena is a processor for λδ, + Helena is a processor for the systems of the λδ family, implemented in Caml as a part of the HELM software, - meant for testing the stable features of the calculus as well as the unstable ones. + meant for testing both their stable and unstable features. The processor source code is available in the directory @@ -45,9 +46,29 @@ of the HELM Svn repository. The Svn revisions containing the stable versions of Helena are indicated next. + + + + Supports exportation to λProlog + (two formats for ELPI, + and two formats for Teyjus). + Employs optimized conditional compilation through + camlp5 code preprocessor (pa_macro) + to reduce a performance loss, which is expected to disappear + by employing a different code preprocessor. + Overall validation speed of the "Grundlagen der Analysis" with respect to version 0.8.2: + +3% with optimized compilation, +5% without optimized compilation. + [Svn revision: 13108] (archived source code). + + + The corrected specification of Landau's "Grundlagen der Analysis" + is successfully validated in a λProlog implementation of λδ version 3. + + + - Uses λδ "Version 3" with layer variables as core language. + Uses λδ version 3 with layer variables as core language. Supports exportation to Gallina (the specification language of Coq), and to Grafite @@ -77,12 +98,13 @@ The corrected specification of Landau's "Grundlagen der Analysis" - is successfully validated in λδ "Version 3". + is successfully validated in λδ version 3. + - Uses a subset of λδ "Version 4" as intermediate language. + Uses a subset of λδ version 4 as intermediate language. Features importation from ".hln" files containing λδ textual syntax. The overall validation speed of the "Grundlagen der Analysis" increases of 22% with respect to version 0.8.0. @@ -99,9 +121,10 @@ index of computer math systems. + - Supports λδ "Version 2" with naive implementation of impredicative sort inclusion. + Supports λδ version 2 with naive implementation of impredicative sort inclusion. Features importation from Automath and exportation to XML. Documentation (R2a). @@ -122,5 +145,73 @@ is successfully processed, enabling sort inclusion. + + Open Symbolic Notation + + Open Symbolic Notation (OSN) is an easy data-interchange textual format + based on symbolic expressions. + OSN is completely language independent but uses widely accepted conventions. + These features make OSN ideal for storing and exchanging tree-like data structures + in a lightweight manner. + + + An OSN text uses the UTF-8 character set + and contains the next tokens: + + + + + + + + + + + + + + this token can represent the identifiers and the numerical constants of most programming languages; + + + + + + + + + + every valid UTF-8 character whose code point is greater than U+001F is accepted eccept " \ + the next commonly accepted escape sequences are recognized: \0 \a \b \t \n \v \f \r \e \" \\ + morover, the escape sequences \x <two hexadecimal digits> and \u <four hexadecimal digits> + allow to specify a character by its code point + finally the escape sequences \( for U+0002 and \) for U+0003 are available + + + + + + + + + + + this token starts a compound symbolic expression; + + + + + + + this token ends a compound symbolic expression; + + <ignored> each of the characters U+0009..U+000D U+0020 , ; = + these characters are ignored and separate the other tokens + + <reserved> any character not starting any other token + these characters are not allowed, + and those in the range U+0021..U+007E are + ! # $ % & ' * / ? @ \ ^ ` | ~ + +