|''with file''|<bla t="$t">$a</bla>|

|''set''|a|''to''|bla|
|''set''|t|''to''|T|

|''get template''|templateDiry/test.txt|'''is'''|<bla t="T">bla</bla>|

|''set''|a|''to''|Z|
|''set''|t|''to''|U|

|''get template''|templateDiry/test.txt|'''is'''|<bla t="U">Z</bla>|