Difference between V2 and V3 in share point

Question

Difference between

"http://schemas.microsoft.com/WebPart/v2"

AND

"http://schemas.microsoft.com/WebPart/v3"

in SharePoint web part provision?

Answer 1

The difference between .dwp and .webpart

The difference is .dwp was the file extension used in version 2 of SharePoint and .webpart is a new extension used in version 3. Inside the files, the schemas are different and it is indicated as such by the version number on the xmlns attribute.