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#### 12.7.6 Special characters in DocBook export

Special characters that are written in TeX-like syntax, such as `\alpha`, `\Gamma`, and `\Zeta`, are supported by DocBook exporter. These characters are rewritten to XML entities, like `&alpha;`, `&Gamma;`, and `&Zeta;`, based on the list saved in variable `org-entities`. As long as the generated DocBook file includes the corresponding entities, these special characters are recognized.

You can customize variable `org-export-docbook-doctype` to include the entities you need. For example, you can set variable `org-export-docbook-doctype` to the following value to recognize all special characters included in XHTML entities:

         "<!DOCTYPE article [
         <!ENTITY % xhtml1-symbol PUBLIC
         \"-//W3C//ENTITIES Symbol for HTML//EN//XML\"
         \"http://www.w3.org/2003/entities/2007/xhtml1-symbol.ent\"
         >
         %xhtml1-symbol;
         ]>
         "