Get supported ids/formats via UNAPI
libxess.php
Get supported format(s) for urn:isbn:006073132X
libxess.php?id=urn:isbn:006073132X
Retrieve urn:unsupported:xxx, should return 404
libxess.php?format=marcxml&id=urn:unsupported:xxx
Retrieve urn:bibrecord:b2275560 but request unsupported format, should return 406
libxess.php?format=an_unsupported_format&id=urn:isbn:006073132X
Retrieve urn:bibrecord:b2275560
libxess.php?format=marcxml&id=urn:bibrecord:b2275560
Retrieve urn:isbn:006073132X
libxess.php?format=marcxml&id=urn:isbn:006073132X
Retrieve urn:isbn:0585202648
libxess.php?format=marcxml&id=urn:isbn:0585202648
Retrieve Title urn:title:freakonomics
libxess.php?format=marcxml&id=urn:title:freakonomics