Abstract: JDF (Job Definition Format) is a comprehensive XML-based file format that combines information description tags and information transmission protocols to provide an industry standard for end-to-end working specifications; XML is JDF and CIM (computer integration Manufacturing) pillar technology. This paper introduces the production and development status of XML and XML-based JDF format, and then introduces the key technology of using XML-based JDF to integrate the production process chain. Finally, the development trend of the research field is analyzed.

Keywords: job definition format (JDF), XML system integration, workflow, CIP4, workflow management, job tracking

introduction

The production of the printing industry has undergone dramatic changes over the years. For a long period of time, all production has been manual. Subsequent mechanization has led us to the road of automation. Up to now, we already have a highly efficient automatic production system. However, in most production environments, the communication between the equipment is not enough, and the processing process is not smooth enough. In order to adapt to the changes in the current market, industrial production is facing the following trends:

Shortening the job cycle and increasing the complexity of the job require a flexible response

The enhancement of automation requires more effective, flexible and transparent production engineering. When we have effective automatic control, we naturally need work subpoenas. Using the information provided by the subpoenas, production can be more efficient.

The integration of all supply and production chains inside and outside the company can be achieved through JDF. Based on modern network and database technology integration, a higher input-output ratio can be achieved. Such an integrated system can enhance the effectiveness of data acquisition and reduce preparation time. , Shorten the production cycle and increase production flexibility, which provides convenience to equipment providers, producers and customers.

In the fierce global competition, the printing and publishing industry has successively applied a series of process application software to improve the management level and production capacity of enterprises, but these softwares cannot communicate, forming an information island. Ignore the flow of information from the job order from the customer's order to the final product delivery process. The main reason is that the cooperation between different suppliers only stays on a very limited basis, which requires time to coordinate different production. Equipment. Although the XML language has the ability to encode multiple languages, it is not fully applicable.

Moreover, in the printing workflow, the biggest and most important obstacle is the communication between the management information system (MIS) responsible for planning and control and the production service system responsible for operations. In other words, there is no automatic, coordinated and effective two-way communication method between these two aspects. All data enumerating plans, arrangements, processing results, working conditions, and work tracking must be passed from the production department to the MIS before MIS can process the information and provide a work instruction. Currently this is still a manual process. Now that we have a complete set of processing procedures composed of various equipment functions and all the necessary conditions for completing jobs, we cannot integrate them into a coherent work. The so-called digital unity of cash is a piecemeal of this piecemeal, efficiency Very low, and will eventually be abandoned by the digital age.

Everything is available, only the Dongfeng owes. The development of the industry has entered the direction of standardization, standardization and automation from the traditional production method that pays more attention to manpower. In July 2000, CIP3 was renamed CIP4, and CIP4 / JDF standards were formulated. CIP4 is the abbreviation of "International Cooperation for Integration of Processes in Prepress, Press and Post-press"; JDF is "Job Definition Format" . The JDF launched by CIP4 focuses on the integration of data in various links in the printing process and the information integration of finance, accounting, and management information system (MIS) to achieve computer integrated management (CIM) in the entire printing process. Printing plants applying the JDF process will realize the fully automated process of quotation, pick-up, work order arrangement, production, work order tracking, product delivery, invoicing, and collection. JDF (Job Definition Format) is a comprehensive XML-based file format that combines information description standards and information transmission protocols to provide industry standards for end-to-end working specifications.

XML is the standard for data exchange recommended by W3C. The formulation work began in 1996, and the printing and publishing industry also needs a complete and powerful set of standards to support e-commerce, automation and CIM, and the ability to unite various printing links. , Which ultimately led to the creation of an XML-based JDF file format. But how do the technical features of XML and JDF make it the industry standard? Let's do an analysis below.

Technical Analysis of Extensible Markup Language

XML is data-oriented, it supports user-defined tags, and organizes data through nested elements that satisfy a certain logical relationship. The tags of the XML document only describe the content of the document, not how to display and output formatted information. . The application can recognize the tags in the XML document and process the exchange standards according to the semantics of the tags. Below we analyze some characteristics of XML as the basis of JDF to describe the production process and information exchange:

XML has some characteristics of process description language;
(1) XML is a self-describing language centered on tags;
(2) The mark order of XML can indicate the sequence between activities;
(3) The inherent waterfall hierarchical structure of XML can intuitively represent the parent-child relationship between activities, and realize data connection with the JDF tree structure.

XML and Java technology

XML and Java technologies have many complementary features. The combination of the two will form a powerful platform for data sharing and processing. On the one hand, XML can define data and documents in an open and neutral way. The application of these data or documents; on the other hand, the Java platform provides a unified computing environment, especially portable Java code can be downloaded to any Java virtual machine through the network, and the combination of XML and Java Based on their inherent collaboration.

The XML-based data exchange format (the architecture is shown in Figure 1) has the following outstanding advantages:

(1) Self-description, extensible, and linguistically marked tags can be added to make the meaning of the data very intuitive;
(2) Smarter documents can be created with the help of DTD / XML Schema;
(3) It has a standard, unified and universal parser interface, avoiding the limitation of specific document formats;
(4) If the meaning of the mark is not clear and sufficient, you can freely comment without affecting the interpretation of the document;
(5) Under the premise of complying with the DTD specification, the order of data in the document can be adjusted as needed without affecting the analysis of the document;
(6) Through the query interface (developed by yourself or commercial software XQL, XML-QL, etc.), you can easily query and extract the semantic features of the user's needs in large XML documents;
(7) Combined with XSL, you can easily display certain data in a specific style according to your needs;
(8) There is a good interface with the database, and a large number of XML documents can be stored and managed using the database.

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