  We report the serendipitous detection of the planetary nebula NGC 5315 by the
Chandra X-ray Observatory. The Chandra imaging spectroscopy results indicate
that the X-rays from this PN, which harbors a Wolf-Rayet (WR) central star,
emanate from a T_X ~ 2.5x10^6 K plasma generated via the same wind-wind
collisions that have cleared a compact (~8000 AU radius) central cavity within
the nebula. The inferred X-ray luminosity of NGC 5315 is ~2.5x10^{32} erg
s^{-1} (0.3-2.0 keV), placing this object among the most luminous such ``hot
bubble'' X-ray sources yet detected within PNe. With the X-ray detection of NGC
5315, objects with WR-type central stars now constitute a clear majority of
known examples of diffuse X-ray sources among PNe; all such ``hot bubble'' PN
X-ray sources display well-defined, quasi-continuous optical rims. We therefore
assert that X-ray-luminous hot bubbles are characteristic of young PNe with
large central star wind kinetic energies and closed bubble morphologies.
However, the evidence at hand also suggests that processes such as wind and
bubble temporal evolution, as well as heat conduction and/or mixing of hot
bubble and nebular gas, ultimately govern the luminosity and temperature of
superheated plasma within PNe.
