http://vizier.unistra.fr/viz-bin/conesearch/I/252/out?RA=45.0&DEC=0.07460390065517808&SR=0.1&VERB=3

Line 44: W06: Invalid UCD 'ID_MAIN': Unknown word 'ID_MAIN'
      <FIELD name="USNO-A2.0" ucd="ID_MAIN" datatype="char" arraysize="13*"><!-- ucd="meta.id;meta.main" -->

Line 47: W06: Invalid UCD 'POS_EQ_RA_MAIN': Unknown word 'POS_EQ_RA_MAIN'
      <FIELD name="RA_ICRS" ucd="POS_EQ_RA_MAIN" ref="H" datatype="double" width="10" precision="6" unit="deg"><!-- ucd="pos.eq.ra;meta.main" -->

Line 50: W06: Invalid UCD 'POS_EQ_DEC_MAIN': Unknown word 'POS_EQ_DEC_MAIN'
      <FIELD name="DE_ICRS" ucd="POS_EQ_DEC_MAIN" ref="H" datatype="double" width="10" precision="6" unit="deg"><!-- ucd="pos.eq.dec;meta.main" -->

Line 44: W06: Invalid UCD 'ID_MAIN': Unknown word 'ID_MAIN'
      <FIELD name="USNO-A2.0" ucd="ID_MAIN" datatype="char" arraysize="13*"><!-- ucd="meta.id;meta.main" -->

Line 47: W06: Invalid UCD 'POS_EQ_RA_MAIN': Unknown word 'POS_EQ_RA_MAIN'
      <FIELD name="RA_ICRS" ucd="POS_EQ_RA_MAIN" ref="H" datatype="double" width="10" precision="6" unit="deg"><!-- ucd="pos.eq.ra;meta.main" -->

Line 50: W06: Invalid UCD 'POS_EQ_DEC_MAIN': Unknown word 'POS_EQ_DEC_MAIN'
      <FIELD name="DE_ICRS" ucd="POS_EQ_DEC_MAIN" ref="H" datatype="double" width="10" precision="6" unit="deg"><!-- ucd="pos.eq.dec;meta.main" -->

   

xmllint results:

vo.xml:4: element VOTABLE: Schemas validity error : Element '{http://www.ivoa.net/xml/VOTable/v1.3}VOTABLE': No matching global declaration available for the validation root.
vo.xml fails to validate