\xmlns:html{http://www.w3.org/1999/xhtml}

\def\gabc[body]{
  \<html:grego-chant>{\body}
}
\alloc\gabc/use-drop-cap
\alloc\gabc/annotation
\def\gabcspace{GABCSPACE}
\def\gabc[body]{
  \scope{
  \put?\gabc/use-drop-cap{true}
  \put?\gabc/annotation{}
  \<html:grego-chant>[annotation]{\get\gabc/annotation}[use-drop-cap]{\get\gabc/use-drop-cap}{\body}}
}
\def\gabcinline[body]{
  \<html:grego-chant>[inline]{}[use-drop-cap]{false}{\body}
}