groups elements which specify the name of a formal definition
language used to provide formatting or rendition information.identifies the language used to describe the rendition.모양을 기술하는 언어를 식별한다.identifica el lenguaje usado para describir la
interpretación.当該描出を解説する言語を特定する．identifie la langue employée pour décrire le renduidentifica la lingua utilizzata per descrivere la
resaCascading Stylesheet Language연속식 스타일시트 언어Lenguaje de CSSCSSlangage CSS (Cascading Stylesheet )linguaggio CSSExtensible Stylesheet Language Formatting Objects확장가능 스타일시트 언어Objetos extensibles del formato del lenguaje de
StylesheetXSL-FOLangage XSL (Extensible Stylesheet )Formatting
Objectslinguaggio XSL-FOInformal free text description격식이 자유로운 텍스트 기술Descripción informal y libre del texto自由記述．description en texte libre non structuré.descrizione informale testo liberoA user-defined rendition description language사용자 정의 해석 기술 언어Un idioma descriptivo de interpretación definido
por el usario.利用者が決めた，描出記述言語．langue de description de l'interprétation définie
par l'utilisateurlinguaggio di descrizione della resa definito
dall'utente
If no value for the @scheme attribute is provided, then the default assumption should be that CSS is in use.
supplies a version number for the style language provided in scheme.
@schemeVersion can only be used if @scheme is specified.
If schemeVersion is used, then scheme should also appear, with a value
other than free.