Atom.content is not correct in dr-flat.rnc

[greenTara]

Instead of

Atom.content =
  meta-roles.content,
  degree?,
  (# operator optional for frame representation
   element op { op-atom.type }
   | op-atom.content)?,
  Atom-slots.extend1,
  Atom-repo.extend,
  Atom-slots.extend1,
  Atom-slots.extend2

Should be

Atom.content =
  meta-roles.content,
  degree?,
  (# operator optional for frame representation
   element op { op-atom.type }
   | op-atom.content)?,
  Atom-slots.extend1,
  (Atom-repo.extend,
  Atom-slots.extend1)?,
  Atom-slots.extend2

[greenTara]

The convertor from XSD to RNC appears to not handle

<xs:sequence minOccurs="0">

correctly.

There are 6 occurrences of this syntax in dr-flat.xsd

[greenTara]

The following patterns are affect by this issue
Atom.content
Expr.content
Plex.content
ReactionRule.content
Time.content
Spatial.content

[greenTara]

Consider replacing (e.g. by XSLT)

<xs:sequence minOccurs="0">

with

<xs:choice minOccurs="0">
<xs:sequence>

[apaschke]

The replacement of <xs:sequence minOccurs="0"> with <xs:choice minOccurs="0">
xs:sequence did not solve the translation problem. The nested xs:sequence gets ignored which leads to a wrong choice content model.