useref Element

<useref refid="referenced id" />

The id of the define block to use. To reference blocks inside an imported configuration, use the following syntax:

importedName::defineBlockName

<!-- references a reference inside the current mapping --> 
<useref refid="define1" /> 

<!-- references a define block from an external mapping which is imported in the 
     current mapping(imported1) --> 
<useref refid="imported1::define1" /> 

<!-- here the current configuration imports imported1 which imports imported2. The 
    reference references define1 inside imported2  --> 
<useref refid="imported1::imported2::define1" />