Application and Analysis of JDF Based on XML in Printing Digitalization Workflow (two)
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JOB DEFINITION FORMAT (JDF) Technical Analysis
JDF and Job Messaging Format (JMF) are developed for advanced interfaces based on XML standards. JDF format must provide device-independent communication between different production areas and MIS. JDF is a very comprehensive and flexible exchange format, which is independent of The system structure, operating system and production software, the description file also includes JMF's advanced interface for production equipment. JDF has three significant advantages:
1. It standardizes the prepress, print and postpress formats of any printed job;
2. It bridges the gap between production and processing services and management information services (MIS);
3. Regardless of the site structure or production method that the print job will be completed, it can achieve both functions.
JDF provides a mechanism to control all production processes. JDF's task is to process the information flow of each part of the job from start to finish and to link the MIS and production equipment. What is important is that JDF can execute both tools regardless of the tool used. Tasks. Unlike other job ticketing formats, JDF allows you to describe all the processes required to complete a production, from job ordering to finished product delivery. Each process is transformed into a node, the entire work is described as a node tree, all nodes are grouped together to describe the required products, and each node is defined as input and output.
JDF is an open standard for all semi-automated business and production processes for the smooth exchange of information between different systems and applications, and attempts to integrate the entire printing and publishing industry, including on-demand printing companies and e-commerce companies. The advantage of JDF is that it provides a bridge between the various parts of the print workflow, from the customer's order to the finished product. It also enables unimpeded information exchange between MIS (Management Information System) and the generation service department, as well as timely and effective communication of customer opinions and production status.
JDF describes the whole work as the hierarchical network of operations. The nodes are connected by the consumption input and the product output. The output of each node will be the input of further processing in order. The final result is the composition of all the outputs to get the desired. Finished product. JDF embeds individual actions into the macro process, making it part of the overall system structure.
JDF can be used to handle businesses of any size, from a few jobs to dozens of jobs. JDF can reduce the configuration costs for implementing communication between different provider systems. It also helps to complete every aspect of a print job, from manufacturing to shipping.
Operation processing hierarchy
JDF jobs consist of a series of nodes that specify production steps, nodes are connected by input and output, and are arranged in a hierarchical tree structure that describes the final product and different parts of production, such as the cover and insert in Figure 3. . The information about the branches contained in the nodes becomes more detailed and accurate. Each child node defines a component of production and has a series of unique characteristics, such as different media, different physical sizes, or different color requirements. The nodes represent a set of operations required to produce each part of the product. Each node that is near the end of the branch represents a separate operation. The child node covers and inserts in the example all have very different needs. Therefore, the two nodes need to better describe the job elements in a broad sense, and there are black and white pages and color pages on the inner page, which requires different operations, and further branches are required.
Because the output resources of many JDF nodes are the input resources of other nodes at the same time, many nodes do not work until their resources are all in place, which means that the nodes need to work in the set order. For example, the output resource plate of the platemaking process is the input resource required for the next printing process. In the JDF hierarchical tree structure, the upper node represents a higher level and more abstract operation, and the bottom is closer to the bottom, which means more detailed and specific. Operation. In particular, the nodes near the top of the tree simply represent the meaning of the various components of the product. The leaf node provides the device with specific detailed operational instructions.
In the hierarchical structure of the node tree, nodes are connected to the service chain by their respective resources, and the output resource of one node is the input resource of the next node. This relationship is called a resource connection. A complex service network can be built using resource connections.
The business connection in JDF is not clearly stated, and the nodes do not arrange abstract timetables and instructions. For example, the color printing node must be defined before the RIP node, but implicitly defined in the exchange of input and output. Business network, all business execution through these compliance drivers, a resource compliance may contain multiple business path scripts, MIS uses relevant local constraints to determine the appropriate solution, so the proxy server that writes JDF jobs in MIS It should also be consistent with these local constraints, such as the pre-press software's dominance, prepress equipment and printing transmission distance, print load and delivery time should be taken into account. All of these factors are combined to describe the production process. To help define the workflow for the proxy server, JDF provides four different types of basic service routing mechanisms that can be combined in any combination:
· Continuous processing (in general, resources are continuous production and consumption, the simplest business chain)
· Overlapping (simultaneous production and consumption of resources)
· Parallel processing (resource decomposition dominance and sharing)
. Iterative processing (generating resources through loop iterations of before and after processing)