.. module:: sqlalchemy.sql.expression
-The expression API consists of a series of classes that each represent a
+The expression API consists of a series of classes each of which represents a
specific lexical element within a SQL string. Composed together
into a larger structure, they form a statement construct that may
be *compiled* into a string representation that can be passed to a database.
made available. The SQLAlchemy :term:`mapping` process,
among other things, adds database-enabled :term:`descriptors`
to a mapped
- class which each represent a particular database column
+ class each of which represents a particular database column
or relationship to a related class.
identity map