When using the CommonIncludes pattern you may come across duplicated content that varies with only one or two values. This can make using includes difficult but when combined with variables, includes become even more powerful. You can parameterize included pages by declaring variables in the test page and referencing them in the included page.

First we'll include a paraterized include page without defining any varaibles.

Now we define the required variables.
variable defined: NUMERATOR=100
variable defined: DENOMINATOR=10
variable defined: QUOTIENT=10

We can redefine the variables and use the parameterized include again.
variable defined: NUMERATOR=555
variable defined: DENOMINATOR=5
variable defined: QUOTIENT=111