I try to understand how to create theme for magento.
I read the documentation on how the layout works. But I have a problem with the attribute name.
name = This is the name by which other blocks can make reference to the block in which this attribute is assigned (see diagram 3).
In this example : we see in Page.xml name="right" and corresponds to the reference name define in Catalog.xml
But how does one know that it is in Catalog.xml need to go see?