A corporation's database needs to record data concerning staff members $($identified by $`$sid$`,$ with attributes $`$wage$`$ and $`$email$`),$ projects $($identified by $`$pid$`,$ with attributes $`$pname$`$ and $`$funding$`),$ and pets of staff members $($identified by $`$pet$\_$name$`,$ with $`$species$`$ as attributes$).$

A staff member is assigned to one or more projects, and each project must have one staff member who acts as the project leader. A staff member can have multiple pets while each pet has one owner.