public Map<String, SchemaName> getElementSchemas() {
		return Map.copyOf(elementSchemas);
	}
Define the schema for a child element

@param index the index whose schema to define, or "" for the default
@param schema the schema defining the element
@param origin optional, for diagnostics, an object describing the element schema's origin
@return this builder
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/model/target/schema/SchemaBuilder.java