Introduction
uPortal now has an export/import system using xml files generated by Cernunnos export scripts. Basically, you will run an export command on your existing portal project to generate a number of xml data files. You then run import in your uPortal3 project to import the data from these xml files into your uPortal3 database. Take a look at the Cernunnos overview to get a better understanding of this process.
Default Database
The default database is populated by the db-import task in build.xml. This task is called by ant initdb, which in turn is called by ant initportal. The db-import task actually uses crn-import to create the database:
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<antcall target="crn-import">
<param name="dir" value="${basedir}/uportal-impl/src/main/resources/properties/db/entities" />
</antcall>
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As you can see, it simply calls crn-import on the entities directory. Take a look at this directory to see the xml format for groups, layouts, channels, etc.