Header arguments in Org-mode properties

Header arguments are also read from Org-mode properties (see Property syntax), which can be set on a buffer-wide or per-heading basis. An example of setting a header argument for all code blocks in a buffer is

     #+property: tangle yes

When properties are used to set default header arguments, they are looked up with inheritance, so the value of the :cache header argument will default to yes in all code blocks in the subtree rooted at the following heading:

     * outline header
     :PROPERTIES:
     :cache:    yes
     :END:

Properties defined in this way override the properties set in org-babel-default-header-args. It is convenient to use the org-set-property function bound to C-c C-x p to set properties in Org-mode documents.