ODD chaining

ODD chaining - a technique of structuring individual ODD documents in such a way that it is possible for one document to re-use (and potentially modify) declarations and definitions from another document.

Places where one might expect to find information on ODD chaining:
 * http://www.tei-c.org/release/doc/tei-p5-doc/en/html/TD.html  (ch. 22)
 * http://www.tei-c.org/release/doc/tei-p5-doc/en/html/USE.html (ch. 23)
 * http://www.tei-c.org/Guidelines/Customization/odds.xml
 * http://www.tei-c.org/release/doc/tei-p5-doc/en/html/ref-att.global.source.html