Base abstract reader class. A Reader class defines the metadata of the data that needs to be read. The actual
datasource is defined as by a
DataProxy implmentation. A
Store is build using a Reader and a DataProxy and is capable of
actually reading the data out of the data source into
Record objects. Several widgets like
com.gwtext.client.widgets.form.ComboBox and
com.gwtext.client.widgets.grid.GridPanel are backed by
Store to provide the "model" for the widget.