code: function (qualifiedName, publicId, systemId) {
          return Node.createDocumentType({
              name: qualifiedName,
              publicId: publicId,
              systemId: systemId
          });
      }
docs: hasFeature: function () { /*TODO*/ }, getFeature: function () { /*TODO*/ }, 
  createDocumentType
  
  @param {string} qualifiedName qualified Name
  @param {string} publicId public ID
  @param {string} systemId system ID
  @return {Node}