Complex type of validation is the vtype. This can be used to validate and restrict user input, and report back error message. Some of most common vtype are:

1. email
2. url
3. alpha
4. alphanum

This is a function of Ext.data class. It is use to store data in the variable formatting similar to tabular data. For example
          var genres=new Ext.data. SimpleStore ({
                   fields:[‘id’,’genre’],
                   data:[[‘1’,’Comedy’],[‘2’,’Drama’],[‘3’,’Action’]]
         });

An xtype is just a reference to a particular Ext form component. xtype that defines what type of a field it is. Here are examples of the some common xtypes that are available to us:

1. textfield
2. timefield
3. numberfield
4. datefield
5. combo
6. textarea

A comma-separated values (CSV) file stores tabular data (numbers and text) in plain-text form. CSV is a simple file format that is widely supported by consumer, business, and scientific applications. It might be used to transfer information from a database program to a spreadsheet.

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