old_contents: export class Attribute {
  
      constructor(data) {
  
          this.name = (data && data.name) || "default"
          this.globalUnique = (data && data.globalUnique) || false
          this.localUnique = (data && data.localUnique) || false
          this.type = (data && data.type) || ""
          this.default = (data && data.default) || {type: "String", value: ""}
          this.constant = (data && data.constant) || false
          this.singleAssignment = (data && data.singleAssignment) || false
          this.expression = (data && data.expression) || ""
          this.ordered = (data && data.ordered) || false
          this.transient = (data && data.transient) || false
      }
  }
new_contents: export class Attribute {
  
      constructor(data) {
  
          this.name = (data && data.name) || "default"
          this.globalUnique = (data && data.globalUnique) || false
          this.localUnique = (data && data.localUnique) || false
          this.type = (data && data.type) || "String"
          this.default = (data && data.default) || {type: "String", value: ""}
          this.constant = (data && data.constant) || false
          this.singleAssignment = (data && data.singleAssignment) || false
          this.expression = (data && data.expression) || ""
          this.ordered = (data && data.ordered) || false
          this.transient = (data && data.transient) || false
      }
  }
subject: fix in Attribute