A reference database containing, for example, bibliographic data of a computer-readable document like a text document is stored together with the text document in a single data file. The reference data are therefore always accessible for the user of the document. ...http://www.google.com.hk/patents/US20010003818?utm_source=gb-gplus-share專利 US20010003818 - Method and system for creating a reference database for a computer-readable document
