More about Parse XML rules
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Parse XML rules are frequently used with Web services and so are often referenced in Connect SOAP, Connect dotNet, Service SOAP, and Service dotNet rules. However, you can reference Parse XML rules in other types of service and connector rules.
To execute a Parse XML rule in an activity, use the Apply-Parse-XML method.
Parse XML rules created in versions before V5.5
operate correctly in V5.5 without change. However, the map definition is
deprecated for new development. To convert to the V5.5 format to allow
changes, save the older rule into an open RuleSet Version and click the
Upgrade button on the Mapping tab.
Although the first key part of this rule is known as the Namespace, it does not conform to any official XML namespace, but serves a similar function, to partition the set of possible parsing rules to avoid accidental name collisions.
For more information about XML parsing, see these 
Pega Developer Network articles:
prconfig.xml file, you can be alerted to unusually long
Parse XML executions as PEGA0011 alerts. See How to detect lengthy
service operations. C-2432When you save a Parse XML rule, the system converts the steps to Java source code. As a learning or debugging aid, you can review this Java code.
Click the Show Java toolbar button (
) to see the system-generated Java code that
implements the parse XML rule. The window presents a read-only preview of
the Java that implements this rule instance. This Java code is not
identical to the Java that executes at runtime, which includes Java code
inlined from other rule instances and reflects rules in the
requestor's RuleSet list.
 | data mapping, service, connector |
 | Apply-Parse-XML method |
 | Atlas — Standard Parse XML rules |