public void addStruct(ParsedStruct struct) {
        String sName = struct.name();
        verifyThat(! extraStructs.containsKey(sName), "already has struct", sName);
        extraStructs.put(sName, struct);
    }
This class holds the extracted information after parsing
one schema (.sd) file, using simple data structures
as far as possible.

Do not put complicated logic here!

@author arnej27959
config-model/src/main/java/com/yahoo/schema/parser/ParsedSchema.java