In Wiki, under the Designing for Magento > Understanding layout XML files > Layout / page structure,
It said:
Your core Layout is defined by default.xml which is located in /app/design/frontend/default/layout/core/default.xml\\\\\\
But I don’t see the ‘default.xml’ in the ‘core’ folder, actually there isn’t a ‘core’ folder. There is a ‘main.xml’ in the ‘default’ folder and I reckon this is the same ‘default.xml’ correct?
If yes, please update the Wiki (I would go ahead correcting it however I am not 100% sure it’s the same file).
In earlier beta versions, Magento distributed one layout XML per handle plus a default.xml for default layout. In the newer versions, all the XML files have been aggregated to one, which is main.xml, as in app/design/frontend/default/default/layout/main.xml