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Not a general-purpose drawing program, but rather one intended for drawing Under-supported at this point, so the next best thing is a drawing program. Which is what this is really all about, but the step from there to XML is a bit Nothing beats coloured pens and a whiteboard for designing object models, The first part of our project requires us to produce an explicit, formal
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Model), and mapping individual instances from XML to their middle-level form. The task naturally breaks down into two parts: defining the middle level (that is, the abstract data A particular set of technologies is proposed forĪccomplishing this when the language concerned uses XML for its notation. Include fully explicit, operational, definitions of both the intermediate The thesis set out in this paper is that specifications can and should This paper is concerned with theįirst part, primarily from the perspective of the producers and consumers of specifications. Practice) of the constituency of that level. Mapping from notation to intermediate level, and the import (in principle or in So both specifications and implementations often come in two parts: the Reify this intermediate level in the data structures of the implementation substrate. Concrete implementations of such languages often more-or-less directly
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Sometimes called 'abstract syntax' or 'underlying form' or 'abstract data
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An intermediate level, more or less explicit, is appealed to, Understood, and usually defined, without going directly from notation to Two-part, three-level definitions/implementations of (XML) languagesĪll but the simplest of formally defined languages are commonly Learned about that language while carrying out the exercise reported here,Ĭonnections are also made to earlier work on expressing data-binding information via schema annotations, which suggest the possibility of auto-generating the stylesheets required for part (3) above in some cases.ĭan Connolly wrote the first Violet-to-OWL stylesheet, which really Throughout the paper the points under discussion are illustrated withĮxamples taken from the XML Processing Model language, currently underĭevelopment by the W3C XML Processing Model Working Group. This would enable semi-automatic conformance testing, if the language specification actually included the three parts listed above. The result, if consistent, can then also be compared to (RDF expressions of) concrete data model instances from an implementation. The result of implementing this approach is that an OWL ontology for a language data model and an RDF instance corresponding to an individual language document can be combined and checked for consistency. Mapping from language documents to data model instances expressed A set of guidelines for writing XSLT stylesheets or other.A pipeline of XSLT stylesheets to convert the XML representation.Open source graphical UML diagram editor A set of conventions for constructing UML models, using the Violet.This paper describes a novel approach to stating what it calls the proximate semantics of an XML language, that is, the mapping from XML information sets to language-specific (abstract) data models. Another is W3C XML Schema, which explicitly separates the mapping from schema documents to schemas on the one hand from the schema-validation semantics of the schema components which make up schemas on the other. One obvious example is (X)HTML+CSS, where the first step is from document to nested boxes with properties, and the second is a set of claims that boxes+properties make on renderings. Many XML languages are defined in two steps, the first in terms of a mapping from XML documents to an abstract data model, the second by defining the meaning of the constituents of the abstract data model with respect to some domain.