For example, it would be useful to have a breadcrumb portlet in the layout and not have to manually include it on every page. Even we could establish a default configuration.
Other portlets which should be included on the theme could be the language portlet, content search, navigation, etc.
The following examples show how to add a language portlet, to do that we have two posibilities:
a) Adding the portlet to portal_normal.vm with the xml configuration:
b) Adding the portlet to a hidden page, configure it and instance his portlet-id from portal_normal.vm:
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