| MARC XML ArchitectureThe Library of Congress' Network Development and MARC Standards Office is
      developing a framework for working with MARC data in an XML environment.
      This framework is intended to be flexible and extensible to allow users
      to work with MARC data in ways specific to their needs. The framework will
      contain many components such as schemas, stylesheets, and software tools
      developed and maintained by the Library of Congress.   MARC 21 (2709) to/from MARC 21 (XML) Conversion 
        These tools convert MARC data between MARC (2709) and MARC (XML) structures.  The conversion is lossless.
         MARC XML Bus 
        The core piece of the MARC XML framework is the simple and flexible
          MARC XML schema that can carry MARC data and provides a common format
          for writing MARC XML Consumers MARC XML Consumers 
        MARC XML records may be used in "native" MARC XML form. Otherwise,
        the consumers of MARC XML records tend to fall into three categories:
        transformation, presentation, and analysis.
        
         Transformation is the conversion between MARC XML and other metadata formats.Presentation is the display and/or mark up of MARC data into some
          readable form.Analysis is the processing of MARC data to produce analytical output such as validation. 
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