About Decomposition Rule Condition XQuery Expressions

This topic describes how to use the Decomposition Rule editor, Conditions tab, Conditions Details subtab, XQuery subtab to write an expression that associates a condition with a decomposition rule. You can create the condition in the order item specification and select them in the decomposition rule, or you can create them directly in the decomposition rule. See "About Order Item Specification Condition XQuery Expressions" for more information about the context, prolog, and body of condition XQuery expressions.

The following is an example of two decomposition rules, each having a condition set that determines whether an order item is included in the target order component or not. In this example:

The decomposition rule that targets the target system order component for region 1 has the following decomposition condition:
```
isRegion1
```
The decomposition rule that targets the a target system order component for region 2 has the following decomposition condition:
```
isOtherRegion
```

The XQuery for the isRegion1 decomposition rule condition is:

declare namespace im="http://oracle.communications.ordermanagement.unsupported.centralom";
declare namespace osm="http://xmlns.oracle.com/communications/ordermanagement/model";
fn:normalize-space(osm:properties/im:region/text())='Toronto')

This condition specifies the value of the region order item property. If the value is Toronto, the decomposition rule condition is true, and the order item is included in the region 1 target system order component.

The XQuery for the isOtherRegion decomposition rule condition is:

declare namespace im="http://oracle.communications.ordermanagement.unsupported.centralom";declare namespace osm="http://xmlns.oracle.com/communications/ordermanagement/model";fn:not(fn:normalize-space(osm:properties/im:region/text())='Toronto')

This condition also specifies the value of the region order item property, but evaluates to true only if the value is not Toronto. All order items that have any other value are included in the region 2 target system order component.

The following example includes a variation on the isRegion1 decomposition rule that specifies that all the order items from the source order component to the target order component that have at least one order item with a region property of Toronto are included in the order component. Otherwise, if the condition evaluates to false then none of the order items in fromOrderComponent are included in the resulting order component.

declare namespace im="http://oracle.communications.centralom";
declare namespace osm="http://xmlns.oracle.com/communications/ordermanagement/model";
fn:exists(osm:fromOrderComponent/osm:orderItem[fn:normalize-space(osm:properties/im:Region/text())='Toronto'])

For some functions, there is only one target system in the topology. For example, if you have only one collections system in the topology, you will have one dependency rule that uses a simple mapping from the source collections function order component to the collections target system order component, and no decomposition condition is necessary.