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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;
]>
"