كِش IF a الأعلى مستوى هذا مستند من نوع بعض شبه a الأعلى مستوى مثل PHP دائماً مُدْرج جزء من بينما بعض مُدْرج و مثل حالة من CSS.
Check if the DTEP can act as a top level DTEP. This means that the document can be of this type. Some pseudo DTEPs cannot act as a top level DTEP, like PHP as they are always included as part of another DTEP, while some others can be included and act as standalone as well, like the case of CSS.