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JDF is based in the Extensible Markup Language (XML), but not entirely. XML was selected as the underlying standard language for JDF because it is already a widely recognized language and is a standard. The application programming interfaces for programming languages such as Java, C+ and .NET all support XML directly and there are many XML tools, databases, and so on readily available on the market. XML has found a niche and is widely used for communicating content between back-office systems and web servers. XML provides rules of syntax and default data types; however, XML alone is not enough. XML does not require that a document type definition or schema be defined against which “instances” of XML can be checked or “validated.” Validation is critical to many types of applications, especially where data is going to be imported into a database (as in the databases behind your workflow and MIS systems.) JDF is based on the Worldwide Web Consortium’s (W3C) XML Schema Recommendation. By using a schema, JDF allows for validation (think preflighting, but for metadata) and allows CIP4 to create user defined data types, (ex. “Rectangle” or “Matrix” as used in transforms, or “NamedColor”) The JDF Specification also provides specifications for file naming (e.g., URL/URI usage for hot folder exchange) and methods for packing JDF and content files together in MIME Multipart Messages. Both make use of the hypertext transmission protocol (HTTP), which also assumes TCP/IP networking. The selection of a networking protocol and method of exchange are just as important to your process automation program as is the XML component of JDF. The JDF Specification is freely available to the public as is the JDF schema at www.cip4.org. The public schema covers all the requirements of our very flexible environment. In practice, you may want to create a subset of the schema that only uses the components that correspond to your workflow.

http://acroeng.adobe.com/wp/">Adobe Acrobat Engineering http://www.itextpdf.com/">iText® is an open source library that allows you to create and manipulate PDF documents. It enables developers looking to enhance web- and other applications with dynamic PDF document generation and/or manipulation.