how to make use of package "com.sapportals.wcm.repository"

Dear all,

I am trying to make use the package "com.sapportals.wcm.repository" in my SDK development. But when I entered "import com.sapportals.wcm.repository.*;" in my class, a error given out "The import com.sapportals.wcm cannot be resolved.". What should I do?

Thanks

Sam