Variables are used to prevent the same computation being
performed several times as the variable allows you to store
the values so that they can be used later. A variable
represents specific data or a value, and acts as a
placeholder for that value. Unlike a constant value, which
is fixed and unchanging, a variable can be repeatedly
assigned different values. You assign a value to a variable
and the variable maintains the value until you later assign
a new value. Because of this flexibility, it is necessary
for you to declare variables before you use them. Variables
can be treated as a normal attribute, that is, it can be a
source or target of a transform

Variables are used to prevent the same computation being
performed several times as the variable allows you to store
the values so that they can be used later. A variable
represents specific data or a value, and acts as a
placeholder for that value. Unlike a constant value, which
is fixed and unchanging, a variable can be repeatedly
assigned different values. You assign a value to a variable
and the variable maintains the value until you later assign
a new value. Because of this flexibility, it is necessary
for you to declare variables before you use them. Variables
can be treated as a normal attribute, that is, it can be a
source or target of a transform

The Variable that are Locally Deffined for a Particuler 
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