Equity Swaps - What's the "return" on the equity leg?

Does “return” include capital de/appreciation or is it only dividends?

In addition, if, as in the Schweser notes, the notional principal is the portfolio value, is the notional a changing amount updated by the value of the equity portfolil or a fixed amount at the inception of the swap?

It depends on the swap.

Some are capital appreciation only. Others are total return.

The notional value doesn’t change. You calculate the equity return and apply it to the notional.

Thanks!