How does Magento handle layout XML files?
For example if I have created a theme
app/design/frontend/example/theme and copy an XML file from the
base/default/layout directory in my theme's layout directory:
- Does it override the whole file? Meaning will I have to copy the XML file into my theme to begin overriding things, or
- Does it merge with the base/default and override only the changes I have made in my XML file?