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I am wondering if OJS was based on any existing Object Models for online journals. The reason I ask this is because I want to export the database and then transform/map the Relational model to an Object based model. Eventually, I want to be able to extract individual journals to an external format (in other words build a Journal Exporter). I want to discover the tree hierarchy corresponding to the database. For example, I'm guessing that 'Articles' would have 'Journals' as their parent, and 'Published Articles' would inherit from 'Articles', etc.
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The Articles & Issues export tool (see "Import/Export Data" as Journal Manager) has a mapping like you describe for everything at the Issue or Section level and below; to capture an entire journal, you'd probably only need to add the Journal level, which would wrap a journal and all of its configuration and settings. The Articles & Issues export tool is implemented in plugins/importexport/native.
Alternately, you can get a pretty comprehensive picture of the structure by looking at foreign keys; the database structure is described in dbscripts/xml/ojs_schema.xml and the Technical Reference (available on the OJS website) may also be helpful.
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