<Reference id or name> | <Reference location (url, book)> |
| Document Object Model (DOM) Level 3 Core Specification | http://www.w3.org/TR/DOM-Level-3-Core |
| Libxml2parser | http://xmlsoft.org |
| Module xmlerror from libxml2 | http://xmlsoft.org/html/libxml-xmlerror.html |
| XML descritpions | http://www.w3.org/XML/ |