The root level <ReservedSymbolTags> section contains all nodes in the Custom_ReservedTags.xml schema file. Each inner node takes the name of a template .xml node whose value is the name of a symbol file that needs to be copied during the Copy Rule process.
<ReservedSymbolTags>
<bidirectionalSymbol>
bidirectionalSymbol
</bidirectionalSymbol>
</ReservedSymbolTags
The beginning and ending node names, as well as the node value, must match for every child node of <ReservedSymbolTags>.