Checks for the prod-id traits in the area tree. prod-id identifies the producing FO if it has an id attribute.
Checks for the prod-id traits in the area tree. prod-id identifies the producing FO if it has an id attribute.

git-svn-id: 102839466c3b40dd9c7e25c0a1a6d26afc40150a@225269 13f79535-47bb-0310-9956-ffa450edef68

apache/fop,chunlinyao/fop,apache/fop,apache/fop,chunlinyao/fop,chunlinyao/fop,apache/fop,chunlinyao/fop,chunlinyao/fop,apache/fop