\begin{definition}[Definition:Morphism of Schemes]
Let $\struct {X, \OO_X}$ and $\struct {Y, \OO_Y}$ be schemes.
A morphism of schemes from $\struct {X, \OO_X}$ to $\struct {Y, \OO_Y}$ is a morphism of locally ringed spaces from $\struct {X, \OO_X}$ to $\struct {Y, \OO_Y}$.
\end{definition}