id Unique identifier so the element may be referenced content-type “content-type” attribute provides a way to preserve or add semantic distinctions. xml:lang The language in which the value of the element is expressed. Recommended best practice is to use values as defined in RFC 1766, typically 2-letter language codes such as “FR” (French), “EN” (English), and “DE” (German). These values are NOT case sensitive, so “EN” = “en”. The values may include hyphenated differentiators such as “EN-AU” (Australian English) and “EN-US” (United States English).
<!ENTITY % title-atts "id ID #IMPLIED content-type CDATA #IMPLIED xml:lang NMTOKEN #IMPLIED" >