https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
public interface freemarker.core.TemplateMarkupOutputModel<MO extends freemarker.core.TemplateMarkupOutputModel<MO>> extends freemarker.template.TemplateModel
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: freemarker.core.TemplateMarkupOutputModel
  super_class: java.lang.Object
{
  public abstract freemarker.core.MarkupOutputFormat<MO> getOutputFormat();
    descriptor: ()Lfreemarker/core/MarkupOutputFormat;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Lfreemarker/core/MarkupOutputFormat<TMO;>;
}
Signature: <MO::Lfreemarker/core/TemplateMarkupOutputModel<TMO;>;>Ljava/lang/Object;Lfreemarker/template/TemplateModel;
SourceFile: "TemplateMarkupOutputModel.java"