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GDL Exercise 3: Creating Root-Level Constructs

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Exercise

Modify the schema of Exercise 1 to introduce a construct named *PFeature that can be found only at the root level.

Use the following conditions:

  • *PFeature can have any instance name.

  • *PFeature members are the attributes named *Name and *DefaultOption.

  • *PFeature has a construct member named *Poption that should be declared as virtual.

Solution

The following template satisfies the preceding conditions.

*Template:  POPTION
{
    *Name:  "*POption"
    *Type: CONSTRUCT
    *Virtual:  TRUE
}

*Template:  NAME
{
    *Name:  "*Name"
    *Type:  ATTRIBUTE
    *ValueType:  NORMAL_STRING
}

*Template:  SYMBOL
{
    *Type:  DATATYPE
    *DataType:   FILTER_TYPE
    *ElementType:  XML_STRING
    *FilterTypeName: "SYMBOLNAME"
}
*Template:  DEFAULT_OPT
{
    *Name: "*DefaultOption"
    *Type:  ATTRIBUTE
    *ValueType:  SYMBOL
}

*Template:  PFEATURE 
{
    *Name:  "*PFeature"
    *Type: CONSTRUCT
    *Members:  (POPTION, NAME, DEFAULT_OPT)
    *Instances:  <ANY>
}
*Template:  ROOT2
{
    *Inherits: ROOT
    *Members:  (PFEATURE)
}