The second example illustrates receiving a list of disjoint Nodes and also illustrates that an array of results can be received.

Example 2: Get PersonType.LastName, AnimalType.Name where a person has a child or (a pet is of type cat and has a feeding schedule).

The NodeTypeDescription parameters used in the example are described in Table B.6.

Table B.6 – Example 2 NodeTypeDescription

Type Definition Node

Include

Subtypes

QueryDataDescription

Relative Path

Attribute

Index Range

PersonType

FALSE

“.12:LastName”

Value

N/A

AnimalType

TRUE

“.12:Name”

Value

N/A

The corresponding ContentFilter is illustrated in Figure B.6.

image048.png

Figure B.6 – Example 2 filter logic tree

Table B.7 describes the elements, operators and operands used in the example. It is worth noting that a CatType is a subtype of AnimalType.

Table B.7 – Example 2 ContentFilter

Element[]

Operator

Operand[0]

Operand[1]

Operand[2]

Operand[3]

0

Or

ElementOperand=1

ElementOperand = 2

1

RelatedTo

AttributeOperand = NodeId: PersonType, BrowsePath “.”, Attribute: NodeId

AttributeOperand = NodeId: PersonType, BrowsePath “.”, Attribute: NodeId

AttributeOperand = NodeId: HasChild, BrowsePath “.”, Attribute: NodeId

LiteralOperand = ‘1’

2

RelatedTo

AttributeOperand = NodeId: CatType, BrowsePath “.”, Attribute: NodeId

AttributeOperand = NodeId: FeedingScheduleType, BrowsePath “.”, Attribute: NodeId

AttributeOperand = NodeId: HasSchedule, BrowsePath “.”, Attribute: NodeId

LiteralOperand = ‘1’

The results from this query would contain the QueryDataSets shown in Table B.8.

Table B.8 – Example 2 QueryDataSets

NodeId

TypeDefinition NodeId

RelativePath

Value

12:30 (Jfamily1)

PersonType

. 12:LastName

Jones

12:42 (HFamily1)

PersonType

. 12:LastName

Hervey

12:48 (HFamily2)

PersonType

. 12:LastName

Hervey

12:70 (Cat1)

CatType

. 12:Name

Rosemary

12:74 (Cat2)

CatType

. 12:Name

Basil

NOTE The relative path column and browse name (in parentheses in the NodeId column) are not in the QueryDataSet and are only shown here for clarity. The TypeDefinition NodeId would be a NodeId not the symbolic name that is included in the table.