http://www.openmarkup.net/2004/05/om

elements
defs
resource

attributes
interface
realizedAs

complexTypes
Defs.type
Empty.type
Extensible.type
Identifiable.type
Resource.type

simpleTypes
CDATA
Character
Charset
Charsets
ClassName
DateTime
FPI
Fraction
Hex12
Hex24
Hex32
IntegerList
LanguageCode
Length
MediaType
MediaTypes
MultiLength
MultiLengths
NonNegativeIntegerList
Number
PositiveIntegerList
PrefixedQName
Text
UnitLength
URI
URIs

groups
Defs.content
Defs.extra
Resource.content
Resource.extra

attributeGroups
Defs.attlist
Defs.attrib
DefsInterface.attrib
Resource.attlist
Resource.attrib
ResourceInterface.attrib