# Package net.corda.core.node

- Interface Summary
  Interface | Description
  --- | ---
  PluginServiceHub | A service hub to be used by the `class CordaPluginRegistry`
  ServiceHub | A service hub simply vends references to the other services a node has. Some of those services may be missing or mocked out. This class is useful to pass to chunks of pluggable code that might have need of many different kinds of functionality and you don't want to hard-code which types in the interface.
  ServicesForResolution | Subset of node services that are used for loading transactions from the wire into fully resolved, looked up forms ready for verification.

- Class Summary
  Class | Description
  --- | ---
  AttachmentsClassLoader | A custom ClassLoader that knows how to load classes from a set of attachments. The attachments themselves only need to provide JAR streams, and so could be fetched from a database, local disk, etc. Constructing an AttachmentsClassLoader is somewhat expensive, as every attachment is scanned to ensure that there are no overlapping file paths.
  CityDatabase | A simple lookup table of city names to their coordinates. Lookups are case insensitive.
  CordaPluginRegistry | Implement this interface on a class advertised in a META-INF/services/net.corda.core.node.CordaPluginRegistry file to extend a Corda node with additional application services.
  NodeInfo | Info about a network node that acts on behalf of some form of contract party.
  PhysicalLocation | A labelled `class WorldCoordinate`, where the label is human meaningful. For example, the name of the nearest city. Labels should not refer to non-landmarks, for example, they should not contain the names of organisations.
  ServiceEntry | Information for an advertised service including the service specific identity information. The identity can be used in flows and is distinct from the Node's legalIdentity
  ServiceHubKt |
  WorldCoordinate | A latitude/longitude pair.