18. Magento 细节

main database settings,such as host,database name ,user name,password and
some system values.

connections types(read/write)
database adapter
core module class names

directory structure real folder names.
system locale
design and theme configuration
system options

routers
translations files
layout xml files
observers declarations

specific to a certain module.

1.to get part of config:
$store->getConfig($path);

2.to get part of config:
Mage::getStoreConfig($path[,$store]);

3.to check store flag:
Mage::getStoreConfigFlag($path[,$store]);

4.to access by absolute path:
Mage::getConfig()->getNode($path[,$scope]);

Mage::getModel(URI); // 按URI寻找配置标签，然后实例化