Tham khảo tài liệu 'petri net part 19', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Music Description and Processing An Approach Based on Petri Nets and XML 531 Fig. 9. The Music Petri Net of a part of the recapitulation in a sonata form . ScoreSynth Music Petri Nets can be designed developed and executed with an application named ScoreSynth Figure 10 . This application has an integrated environment to manage complex Petri Nets projects and to execute them in different ways until no transitions are enabled a step every n seconds manual step by step manual object execution by object execution . In ScoreSynth music objects associated to places are encoded in an XML format named MX. Fig. 10. The ScoreSynth interface 532 Petri Net Theory and Applications 3. MX MX is an XML dialect currently undergoing the IEEE standardization process IEEE SA PAR1599 . The main purpose of this format is having a comprehensive description of music Haus Longari 2005 . Even if specific encoding formats that represent peculiar music features such as audio tracks or scores are already commonly accepted and in use they are not conceived to encode all this features together. On the contrary we are interested in a comprehensive description of music containing heterogeneous representations in a synchronized way. In order to achieve a comprehensive description of music and complete synchronization among both homogeneous and heterogeneous representations of music contents MX is based on two key concepts an XML-based multi-layer structure and a space-time construct called spine. In the following sub-sections we will define these concepts in detail. Multi-layer structure A comprehensive analysis of music richness and complexity highlights six different levels of music description general logical structural notational performance and audio layers see Figure 11 . General Logic Structural Notational Performance Audio Fig. 11. MX multi-layer structure General layer is mainly devoted to contain catalogue information about the encoded music piece. Logic layer contains information
