what is difference between DataSet.copy() and DataSet.clone()

DataSet.copy() :

• DataSet.Copy() method copies both the structure and data.

Example of clone(): 

                      <pre lang="cs">

                      DataSet dswtihdata;

                     DataSet dsnew;

                     dsnew=dswithdata.copy();

DataSet.Clone() :

• DataSet.clone() method copies the structure of the DataSet including all the datatable schemas, relations and constraints. 
• But Doen't copy any data.

Example of clone(): 
              DataSet ds; //This is containing Data table schema.
              DataSet ds1;
              ds1= ds.clone();