in src/main/java/org/apache/sling/jcr/webconsole/internal/NodeTypeConfigurationPrinter.java [65:79]
    private void printRequiredChildTypes(PrintWriter pw, NodeDefinition child) {
        if (child.getRequiredPrimaryTypes() != null && child.getRequiredPrimaryTypes().length > 0) {
            pw.print(" (");
            boolean first = true;
            for (NodeType required : child.getRequiredPrimaryTypes()) {
                if (!first) {
                    pw.print(", ");
                }
                pw.print(required.getName());
                first = false;
            }
            pw.print(")");
        }
    }