This is the official manual for the latest Org-mode release.

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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, regardless of the value of org-use-property-inheritance. In the following example 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.