@Override
            public String getLocationString() {
                return element.getContainingFile() != null ? element.getContainingFile().getName() : null;
            }
This class is used for methods' implementations for SdSummaryDefinition. Connected with "mixin" to SummaryDefinition
rule in sd.bnf

@author Shahar Ariel
integration/intellij/src/main/java/ai/vespa/intellij/schema/psi/impl/SdSummaryDefinitionMixin.java