### Blockette 051 tests ###

--01-SEED
05100632000,187,06:36:04.0000~2000,187,07:03:20.0000~0001000000

--01-XSEED
<station_comment blockette="051">
  <beginning_effective_time>2000-07-05T06:36:04.000000Z</beginning_effective_time>
  <end_effective_time>2000-07-05T07:03:20.000000Z</end_effective_time>
  <comment_code_key>/xseed/abbreviation_dictionary_control_header/comment_description/comment_code_key[text()="1"]/parent::*</comment_code_key>
</station_comment>


# empty optional endtime

--02-SEED
05100412000,187,06:36:04.0000~~0001000000

--02-XSEED
<station_comment blockette="051">
  <beginning_effective_time>2000-07-05T06:36:04.000000Z</beginning_effective_time>
  <comment_code_key>/xseed/abbreviation_dictionary_control_header/comment_description/comment_code_key[text()="1"]/parent::*</comment_code_key>
</station_comment>
