XML Examples

1
XML Examples

• AIXM 5 RC2

2
Topics

• Overview of XML Schema Definition Language (XSDL)
• Schema components
• AIXM use of XSDL
• Example from the AIXM 5 RC2 xsd files
• VerticalStructure (a generalization on structures
  that includes obstacles)
• Obstacle Areas

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General Scheme
UML Model
XSD files
XML files
HTML view

• AIXM is modelled using UML
• Scripts within the UML model are used to generate
  XSD files. These files act as schema definitions
  for the AIXM data
• The AIXM data is defined as XML files
• Software (Java, XSLT, etc) is used to transform
  the XML data to HTML to be viewed by a browser

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Sample AIXM Data Runway
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Sample AIXM Data Runway Element
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Sample AIXM Data Runway Element
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XML Schema Definition Language (XSDL)

• Member of the XML family of standards
• XML schema is composed of pre-defined components
• Primary components
• Element declarations
• Attribute declarations
• Simple type definitions
• Complex type definitions
• Secondary components
• Attribute group definitions
• Model group definitions
• Identity-constraint definitions
• Notation declarations
• Dependent components
• Model groups
• Annotations
• Attribute uses
• Particles and wildcards

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AIXM use of XSDL

• Datatype definitions
• define AIXM features to encompass detailed
  aeronautical domain information accurately.
• Extension and restriction of datatypes
• define and reuse datatype definitions within the
  schema.
• Element and attribute declarations
• define AIXM features.
• Annotation and documentation
• to enable users to understand the contents of the
  AIXM XSD files.
• Additional schema components
• to incorporate the use of the Geographical
  Mark-up Language (GML), and to make use of
  additional concepts available in XSDL.

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VerticalStructure includes Obstacles
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VerticalStructure element

• Parent is ltschemagt
• A Global element
• Of type VerticalStructureType
• Inherits from the AbstractAIXMFeature
• Defined in XML as a substitutionGroup

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AbstractAIXMFeature
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VerticalStructureType and reference to the
TimeSlicePropertyType
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complexType definition for VerticalStructureTimeSl
iceType
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ObstacleArea element
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ObstacleArea element definition

• The ObstacleArea element is of datatype
  ObstacleAreaType
• ObstacleAreaType is an XSD complexType with
  complexContent
• It extends a primitive datatype that is also
  complexType
• It makes reference to timeSlice
• timeSlice references a TimeSlicePropertyType
  that references a TimeSlice definition
• The ObstacleAreaTimeSlice element is of
  datatype ObstacleAreaTimeSliceType
• The datatype declaration makes reference to the
  element group ObstacleAreaPropertyGroup

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ObstacleAreaPropertyGroup group of element
definitions

• The ObstacleAreaPropertyGroup group of element
  definitions containes three elements
• It also includes three elements that define
  relationships to other AIXM features

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ltchoicegt section of the ObstacleAreaPropertyGroup
group

• The three possible choices are defined as XSDL
  elements
• These elements are associations in the UML model

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UML for ObstacleArea