GDL Exercise 3: Creating Root-Level Constructs
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)
}