PostgreSQL 9.4 document for pg_stat_replication view mentions column name as "backend_xid", whereas when a view described it shows column name as "backend_xmin".
postgres=# select version();
-[ RECORD 1 ]------------------------------------------------------------------------------------------------------------
version | PostgreSQL 9.4beta1 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3), 64-bit
postgres=# \d pg_stat_replication
View "pg_catalog.pg_stat_replication"
Column | Type | Modifiers
------------------+--------------------------+-----------
pid | integer |
usesysid | oid |
usename | name |
application_name | text |
client_addr | inet |
client_hostname | text |
client_port | integer |
backend_start | timestamp with time zone |
backend_xmin | xid |
state | text |
sent_location | pg_lsn |
write_location | pg_lsn |
flush_location | pg_lsn |
replay_location | pg_lsn |
sync_priority | integer |
sync_state | text |
Is it a typo in pg_stat_replication view column ?