AN ENVIRONMENT FOR ENGINEERING EXTENDED AFFIX GRAMMAR ENVIRONMENTS

Existing formalisms for the specification of programming environments are complex and strongly biased by the problems of environment generation. It has been investigated whether a simple two-level grammar, describing a programming language, can be used without further modification for the generation of an environment for that language. We believe that there is enough information in most language definitions - albeit implicitly - to generate most of the tools used in syntax-directed editors. This paper proposes some simple and elegant improvements in the use of place- holders and templates, and in the unparsing mechanism. Although the improvements are implemented in a completely newly designed prototype they can also be applied to existing syntax-directed editors to improve their workability

Development of parsing tools for Casl using generic language technology

An environment for the Common Algebraic Specification Language CASL consists of independent tools. A number of CASL have been built using the algebraic formalism ASF+SDF and the+SDF Meta-Environment. CASL supports-defined syntax which is non-trivial to: ASF+SDF offers a powerful parsing(Generalized LR). Its interactive environment facilitates rapid complemented by early detection correction of errors. A number of core developed for the ASF+SDF-Environment can be reused in the context CASL. Furthermore, an instantiation of a format developed for the representation ASF+SDF specifications and terms provides a-specific exchange format

Extracting mathematical semantics from LaTeX documents

We report on a project to use SGLR parsing and term rewriting with ELAN4 to extract the semantics of mathematical formulas from a LaTeX document and representing them in MathML. The LaTeX document we used is part of the Digital Library of Mathematical Functions (DLMF) project of the US National Institute of Standards and Technology (NIST) and obeys project-specific conventions, which contains macros for mathematical constructions, among them 200 predefined macros for special functions, the subject matter of the project. The SGLR parser can parse general context-free languages, which suffices to extract the structure of mathematical formulas from calculus that are written in the usual mathematical style, with most parentheses and multiplication signs omitted. The parse tree is then rewritten into a more concise and uniform internal syntax that is used as the base for extracting MathML or other semantical information

Extracting mathematical semantics from LaTeX documents

We report on a project to use SGLR parsing and term rewriting with ELAN4 to extract the semantics of mathematical formulas from a LaTeX document and representing them in MathML. The LaTeX document we used is part of the Digital Library of Mathematical Functions (DLMF) project of the US National Institute of Standards and Technology (NIST) and obeys project-specific conventions, which contains macros for mathematical constructions, among them 200 predefined macros for special functions, the subject matter of the project. The SGLR parser can parse general context-free languages, which suffices to extract the structure of mathematical formulas from calculus that are written in the usual mathematical style, with most parentheses and multiplication signs omitted. The parse tree is then rewritten into a more concise and uniform internal syntax that is used as the base for extracting MathML or other semantical information

Recursion Aware Modeling and Discovery For Hierarchical Software Event Log Analysis (Extended)

This extended paper presents 1) a novel hierarchy and recursion extension to the process tree model; and 2) the first, recursion aware process model discovery technique that leverages hierarchical information in event logs, typically available for software systems. This technique allows us to analyze the operational processes of software systems under real-life conditions at multiple levels of granularity. The work can be positioned in-between reverse engineering and process mining. An implementation of the proposed approach is available as a ProM plugin. Experimental results based on real-life (software) event logs demonstrate the feasibility and usefulness of the approach and show the huge potential to speed up discovery by exploiting the available hierarchy.Comment: Extended version (14 pages total) of the paper Recursion Aware Modeling and Discovery For Hierarchical Software Event Log Analysis. This Technical Report version includes the guarantee proofs for the proposed discovery algorithm

Gevolgen van een moeilijke kippenjeugd

Kippengeluk wordt al bepaald in het ei. Een kuiken dat op de juiste temperatuur is uitgebroed is gezonder en waarschijnlijk ook minder angstig dan soortgenoten die het in het ei te heet of te koud hebben gehad. Ook de eerste levensweken van een kip blijken van grote invloed op de latere gezondheidstoestand van het die

Glucogeen rantsoen helpt koe : verlagen melkvet via glucogeen rantsoen zorgt voor verbetering energiebalans

Elke koe kampt aan het begin van de lactatie met een negatieve energiebalans. Aandacht voor de juiste vorm van energie in het rantsoen is geen overbodige luxe, blijkt uit onderzoek. Een glucogeen rantsoen heeft de voorkeur boven een lipogeen rantsoe