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XML Examples

Learn about AIXM elements and obstacle area definitions using XSDL, part of the XML family, and how to incorporate GML for accurate aeronautical information modeling.

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XML Examples

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  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

  3. General Scheme • 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 UML Model XSD files XML files HTML view

  4. Sample AIXM Data: Runway

  5. Sample AIXM Data: Runway Element

  6. Sample AIXM Data: Runway Element

  7. 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

  8. 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.

  9. VerticalStructure includes Obstacles

  10. VerticalStructure element • Parent is <schema> • A Global element • Of type VerticalStructureType • Inherits from the AbstractAIXMFeature • Defined in XML as a substitutionGroup

  11. AbstractAIXMFeature

  12. VerticalStructureType and reference to the TimeSlicePropertyType

  13. complexType definition for VerticalStructureTimeSliceType

  14. ObstacleArea element

  15. “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”

  16. “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

  17. <choice> section of the “ObstacleAreaPropertyGroup” group • The three possible choices are defined as XSDL elements • These elements are associations in the UML model

  18. UML for ObstacleArea

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