Currently, DTD(Document Type Definition) Definition of Music score has been widely studied according to applications, and the methods of automatic transformation from defined DTD to XML Schema is in progress. In addition, studies of structure of DTD definition are focused on the expression of music information by individual format. In this paper, expression method of the music information by continuous string values is suggested using the fact that measure is basically a component of score, and XML Schema is also modelled. In addition, mechanism extracting the music information from XML instance which was expressed using the proposed method is presented. As a result, XML Schema taking the continuous string values could be defined, instance obtained by the proposed method results in increasing efficiency by simplicity of XPATH and reduction of search step compared to previous method. In addition, it is possible for human to make direct expression, and it is known that the instance size decreases.