Hi, The command I can find in the manual to show the syntax tree is (org-element-parse-buffer). However, when the structure is output to the buffer, by using the commands C-u M-: (org-element-parse-buffer), it seems that only the part up to a certain depth is printed. For example, if the current org buffer has the following content: #+TITLE: Hello World Hello World! * HEADLINE 1 ** Sub-topic + ItemA + ItemB - Item1 - Item2 *** Sub-Sub-topic \begin{equation} \label{eq:test} Bx=b \end{equation} When apply C-u M-: (org-element-parse-buffer), the sub-sub-topic level is completely omitted in the printout: (org-data nil (section (:begin 1 :end 35 :contents-begin 1 :contents-end 35 :post-blank 0 :parent #0) (keyword (:key "TITLE" :value "Hello World" :begin 1 :end 22 :post-blank 0 :post-affiliated 1 ...)) (paragraph (:begin 22 :end 35 :contents-begin 22 :contents-end 35 :post-blank 0 :post-affiliated 22 ...) #("Hello World! " 0 13 ...))) (headline (:raw-value "HEADLINE 1" :begin 35 :end 174 :pre-blank 0 :contents-begin 48 :contents-end 173 ...) (headline (:raw-value "Sub-topic" :begin 48 :end 173 :pre-blank 0 :contents-begin 62 :contents-end 173 ...) (section ... ...) (headline ... ...)))) What's the recommended way to show the syntax tree? Thanks. Shiyuan