Annex B (informative) Content Filter and Query Examples ToC Previous

B.2 Complex Examples of Query Filters ToC Previous

B.2.7 Example 4 ToC Previous Next

The fourth example provides an illustration of the Hop parameter that is part of the RelatedTo Operator.

Example 4: Get PersonType.LastName where a person has a child who has a child who has a pet.

Table B.12 describes the NodeTypeDescription parameters used in the example.

Table B.12 – Example 4 NodeTypeDescription

Type Definition Node Include
Subtypes
QueryDataDescription    
    Relative Path Attribute Index Range
PersonType FALSE “.12:LastName” value N/A

The corresponding ContentFilter is illustrated in Figure B.8.

readme_files/image049.png Figure B.8 – Example 4 Filter Logic Tree

Table B.13 describes the elements, operators and operands used in the example.

Table B.13 – Example 4 ContentFilter

Element[] Operator Operand[0] Operand[1] Operand[2] Operand[3]
0 RelatedTo AttributeOperand = NodeId: 12:PersonType, BrowsePath “.”,
Attribute: NodeId
Element Operand = 1 AttributeOperand = NodeId: 12:HasChild, BrowsePath “.”, Attribute: NodeId LiteralOperand = ‘2’
1 RelatedTo AttributeOperand = NodeId: 12:PersonType, BrowsePath “.”,
Attribute: NodeId
AttributeOperand = NodeId: 12:AnimalType, BrowsePath “.”, Attribute: NodeId AttributeOperand = NodeId: 12:HasPet, BrowsePath “.”, Attribute: NodeId LiteralOperand = ‘1’

The results from this query would contain the QueryDataSets shown in Table B.14. It is worth noting that the pig “Pig1” is referenced as a pet by Sara, but is referenced as a farm animal by Sara’s parent Paul.

Table B.14 – Example 4 QueryDataSets

NodeId TypeDefinition
NodeId
RelativePath Value
12:42 (HFamily1) PersonType “.12:LastName” Hervey

NOTE The RelativePath 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 an integer not the symbolic name that is included in the table.

Previous Next