XML stands for EXtensible Markup Language
XML is a markup language much like HTML
XML was designed to carry data, not to display data
XML tags are not predefined. You must define your own tags
XML is designed to be self-descriptive
XML is a W3C Recommendation

1. string
2. Integer
3. float
4. boolean
5. data

store field type is a reference to a valid data store where our data lives. This field use to show data in combo box and grid panel that’s name is store.

Field type is used to configure the ExtJS object with name/value pair. Example of some common field types are, title, url, renderTo etc.

Region field type is used to in ExtJS.ViewPort class for setting the regions: North, West, Center, East, and South.