\catcode`@=11%
%
\def\VDDdlpolygon#1 {%
  \VDDparse@\VDDdef@\VDDparsetmp@#1
  \expandafter\VDDonecircular\expandafter\VDDdpsline@\VDDparsetmp@&:
  \expandafter\VDDtwocircular\expandafter\VDDlpointletter@\VDDparsetmp@&:
}%
\def\VDDdlbalk#1 {%
  \VDDparse@\VDDdef@\VDDparsetmp@#1
  \expandafter\VDDdbalk@\VDDparsetmp@&
  \expandafter\VDDlbalk@\VDDparsetmp@&
}%
\def\VDDdldeellijnpart@#1&#2:#3&#4&#5&#6 {%
  \VDDdpsline@ #1&#4&:
  \VDDlpointletter@ #5&#1&#3&:
}%
\catcode`@=12%
