. . . "Constrained-path LSP in which the path is\nobtained by querying an external source, such as a PCE server.\nIn the case that an LSP is defined to be externally queried, it may\nalso have associated explicit definitions (which are provided to the\nexternal source to aid computation); and the path that is returned by\nthe external source is not required to provide a wholly resolved\npath back to the originating system - that is to say, some local\ncomputation may also be required" . .