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Nested sources may declare variables of their own, possibly overwriting already assigned values. Option localize works like Perls local(): such changes will be reversed after the nested source will have been completely processed - so the original values will be restored. You can specify a comma separated list of variable names or the special string __ALL__ which flags that the current settings shall be restored completely.
\INCLUDE{type=PP file="nested.pp" localize=myVar}
\INCLUDE{type=PP file="nested.pp" localize="var1, var2, var3"}
\INCLUDE{type=PP file="nested.pp" localize=__ALL__} |
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