CCSDS IWS CNES 2230 October 2001 XML Packaging Study

1
CCSDS IWS CNES22-30 October 2001XML Packaging
Study
Nestor Peccia
2
ESOC XML PACKAGING STUDY

• ESOC Study on XML Packaging ( 01.06.01 - 28.02.02
  )
• ESRIN and ESTEC-SSD involved by including their
  Archives (IDA, MUIS AMS) in the proposed
  survey.
• Study Phases
• Consolidation (TN, URD, SRD) (01.06.01 -
  31.10.01)
• Comparison of Archives
• XML survey
• Specification of Mechanism
• selection of Archive
• Prototype development (01.11.01 - 31.01.02)
• Two totally different Archives will be selected
  to demonstrate inter-operability
• Installation presentation at ESOC (01.02.02 -
  28.02.02)

3
ESOC XML PACKAGING STUDY

• TN issued on 15th October 2001
• It contains
• Archive Survey done under ESA EVA initiative (an
  old version)
• XML Technology Survey
• Document Models (DTD / XML Schema)
• Document Linking standards (Xlink, Xbase, Xpath,
  Xpointer)
• Presentation (CSS, XSL/XSLT)
• Programming (SAX, DOM, JAXP, JAXR, JAXM, JAX-RPC,
  Handling binary data)
• Interoperability (Java RMI, CORBA, SOAP)
• Archiving (archive formats, Java JARs)

4
ESOC XML PACKAGING STUDY

• TN issued on 15th October 2001
• XML Applications and Tools
• Applications
• CDF, DEDSL,DocBook, EAST, ebXML,FITS, RDF, SML,
  SVG, XDF, XHTML, XML Query Language)
• Editors
• Adept, Xmetal, XML Spy
• Parsers
• IBM XML4J, Apache Xerces, XP, ORACLE XML parser,
  SUN project X, Lark Larval
• Processors
• Apache Xalan, XT, ORACLE XSL processor
• Web Publishing Frameworks
• Cocoon, EbXML, Zope

5
ESOC XML PACKAGING STUDY

• TN issued on 15th October 2001
• Mapping XML Technology to ESA Archives
• Use Cases
• For functions in the Archive Lifecycle
• Use Case 1 Packaging data for submission to
  archives
• Use Case 2 Extracting information from a SIP
• Use Case 3 Packaging data for Archival Storage
• Use Case 4 Creating a DIP
• Use Case 5 Configuration of Ground Systems
• Use Case 6 Preservation Planning
• For Operational Requirements Across all functions
• Use Case 7 Content Protection (secured servers,
  encryption)
• Use Case 8 authenticity (of the producers of
  files)
• Use Case 9 Streamed Data Download (start process
  before all data arrived)

6
ESOC XML PACKAGING STUDY

• The use cases
• Provide a starting point for the development of
  XML prototype applications
• Next step is the production of the prototype URD
  and SRD
• The packaging mechanism will be defined in these
  2 documents
• Possibilities are
• Replace SFDU technique by an XML packaging
  approach (XML schema reference to binary data
  and all zipped)
• Embedded SFDU within XML
• Next viewgraph will show different mechanism to
  handle binary files

7
ESOC XML PACKAGING STUDY

• The handling of binary data
• 3 techniques
• Using external entity references (by passing a
  reference to the binary data as a URL). The XML
  processor must then be able to retrieve the
  resource via the URL and process the data
  contained there. The transfer of data can use
  FTP, HTTP, IIOP, etc.
• Using notations (by defining a label in a DTD
  which can be referenced in attribute declarations
  or unparsed external entity declarations. The
  external identifier can even be a reference to
  code which is responsible for handling the binary
  data, providing a degree of interoperability.
• Using encoding data within CDATA sections The
  binary data is first encoded into an XML
  compatible text format and then embeds that text
  into a CDATA section of the XML document.