Parsing One or Multiple Models
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You will need to determine if one or many DSL model sources will be parsed into a single metamodel instance. For example, if the DSL sources represent an abstraction of target application sources, it is very likely that DSL source authors will produce many such sources. In that case your parser will need to know how to look for multiple sources.
This requirement defines a simple directory-file crawler. The DSL tooling might accept a project base path and crawl the directory structure matching all files with a file extension defined by your language specification. As each properly named file is encountered and matched it is read, parsed, and the results placed into a single metamodel instance. Associations between sources represented in the metamodel thus form a graph. Once the single metamodel instance has been constituted from all DSL source models you are ready to take one of the three common actions: translate and generate, interpret, or transform into a different kind of model such as a data format suitable for your application.
Relationships Between Metamodels and Target Models
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In this article I have mentioned three potential target uses of an external DSL. I want to restate these here in the context of metamodels to show interesting relationships between metamodels and target artifacts or models.
Here are the three targets I have mentioned: the DSL source model could be parsed and translated into source code to become part of your application; the DSL source model could be parsed and interpreted in your application’s runtime environment; the DSL source model could be parsed and translated into another form of data for your application to consume at runtime.
The first use of the metamodel, to achieve target source code artifact output, is a straightforward albeit usually more complex one. Essentially you are transforming one or more source models into a metamodel and then into a set of target models (or source artifacts).
The last two variations, interpreted and translated data format, have similarities because an interpreted model and any other form of translated data are just varying types of metamodels. In essence taking your metamodel built by your parser and turning it into another data format supported by your application could be thought of and even be executed as a model-to-model transformation. But the point is, it can remain a metamodel. This notwithstanding, if you persist the data format metamodel rather than keep it only in memory, a final persistent transformation as part of a generative process will need to occur.
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Dynamic content/HTML Sub Call from Style Sheet
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I was wondering if anyone knows how to call HTML scripts from different folders. I want the dynamic content and all my online take out software, that is hosted at UK Web Hosting to be on a separate folder so I can call it on many pages rather than editing every single page when I need to make changes. Do I have to use RSS Feeds for this or can I call HTML to specific locations on the page from separate origins?
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Is there a simple way to call dynamic content from a sub-folder? Like:
