Application and Analysis of JDF Based on XML in Printing Digitalization Workflow (1)
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JDF (Job Definition Format) is a comprehensive XML-based file format that combines information description tags and information transfer protocols to provide industry standards for end-to-end work specifications; XML is JDF and CIM (computer integrated manufacturing) Pillar technology. This paper introduces the generation and development of XML and XML-based JDF formats, and then introduces the key technologies for integrating production process chains using XML-based JDF. Finally, the development trend of this research field is analyzed.
Introduction
The production of the printing industry has changed dramatically over the years. For a long time, all production was manual, and then mechanization has brought us to the road of automation. Now, we have an efficient automatic production system. However, in most production environments, the communication between devices is not enough, and the processing process is not smooth enough. In order to adapt to the changes in the current market, industrial production faces the following trends:
1.Shortening of the job cycle
2.Increased job complexity
3.Need a flexible response
Increased automation requires production engineering to be more efficient, flexible and transparent. When we have effective automatic control, we naturally need a work subpoena, and using the information provided by the subpoena, production can be more efficient.
The integration of all supply and production chains throughout the company can be achieved through JDF. Based on modern network and database technology integration, high input-output ratio can be achieved. Such an integrated system can enhance the effectiveness of data acquisition and reduce preparation time. Shorten production cycles and increase production flexibility, which is convenient for equipment suppliers, producers and customers.
In the fierce global competition, the printing and publishing industry has applied a series of process application software to improve the management level and production capacity of enterprises. However, these softwares cannot communicate and form an information island. Ignoring the flow of information from the customer's order to the final product delivery process, the important reason is that the cooperation between different suppliers only stays on a very limited basis, which takes time to coordinate different production. Business equipment. Although the XML language has the ability to encode multiple languages, it is not entirely applicable.
Moreover, the biggest and most important obstacle in the print workflow is the communication between the management information system (MIS) responsible for planning and control work and the production service system responsible for operations. In other words, there is no automatic, coordinated and effective two-way communication between these two aspects. All information enumerating plans, arrangements, processing results, work status and work tracking must be passed from the production department to the MIS, and the MIS can process the information and provide a work instruction. This is still a manual process. Now we have a set of processes consisting of various equipment functions and all the necessary conditions for completing the work, but we can't integrate them into a coherent work. The so-called digital continuum of cash is the piecemeal of this piecemeal, efficiency. Very low, and will eventually be abandoned by the digital age.
Everything is in place, only owing to the east wind. The development of the industry has entered the direction of standardization, standardization and automation from the traditional production mode that pays more attention to manpower. In July 2000, CIP3 was renamed CIP4 and the CIP4/JDF standard was established. 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 information in all aspects of the printing process and the information integration of Finance, Accounting, and MIS (Management Information System) to realize Computer Integrated Management (CIM) in the whole process of printing. The printing plant that uses the JDF process will implement a fully automated process of quoting, pick-up, work order scheduling, production, work order tracking, product shipment, invoicing, and collection. JDF (Job Definition Format) is a comprehensive XML-based file format that combines information description standards and information transfer protocols to provide an industry standard for end-to-end work specifications.
XML is the standard for data exchange recommended by the W3C. The development 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 standard in the industry? Let's do some analysis below.
Extensible Markup Language Technical Analysis
XML is data-oriented. It supports user-defined tags. It organizes data through nested elements that satisfy certain logical relationships. The XML document tag only describes the contents of the document, and does not describe how to display and output formatted information. . The application can identify the tags in the XML document and process the criteria for the exchange based on the semantics of the tags. Below we analyze XML as a JDF basis to describe some of the characteristics of production processes and information exchange:
XML has some features of a process description language;
(1) XML is a mark-centric self-describing language;
(2) The marking order of XML can indicate the order between activities;
(3) XML's inherent waterfall hierarchy can visually represent the parent-child relationship between activities, and achieve data docking with the JDF tree structure.
XML and Java technology
XML and Java technologies have many complementary features, and 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, and of course develop those that can be processed. The application of these materials 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 technology Based on their inherent collaboration.
The XML-based data exchange format (see Figure 1 for the architecture) has the following outstanding advantages:
(1) The self-description, extensibility, and linguistic features can be added to make the meaning of the data very intuitive;
(2) Create more intelligent documentation with the help of DTD/XML Schema;
(3) A standard, unified, and universal parser interface that avoids the limitations of specific document formats;
(4) If the meaning of the mark is not clear enough and sufficient, it can be freely annotated without affecting the parsing of the document;
(5) Under the premise of complying with the DTD specification, the order of the materials in the document can be adjusted as needed without affecting the parsing of the documents;
(6) Through the query interface (developed by itself or commercial software XQL, XML-QL, etc.), it is convenient to query and extract the semantically-characterized materials that meet the user's needs in large XML documents;
(7) In combination with XSL, certain materials can be conveniently displayed in a specific style according to requirements;
(8) It has a good interface with the database, and large quantities of XML documents can be stored and managed using the database.