This module contains static services and default implementations for other core services. In order to keep core dependencies as clean as possible, we avoid accessing helpers like X_Inject or X_Reflect unless they are needed to perform a task. For example, ReflectionService and it's default implementation don't have to know about X_Inject, but it's public service X_Reflect does. So, the implementation goes in xapi-core-reflect, and the static accessor goes in xapi-core-util.