New in version 2.0.
Get value of annotation with name attached to component:
abjad> staff = Staff("c'8 d'8 e'8 f'8")
abjad> marktools.Annotation('special dictionary', {})(staff[0])
Annotation('special dictionary', {})(c'8)
abjad> f(staff)
\new Staff {
c'8
d'8
e'8
f'8
}
abjad> marktools.get_value_of_annotation_attached_to_component(staff[0], 'special dictionary')
{}
Return arbitrary value of annotation.
Return default_value when no annotation with name is attached.
Raise extra mark error when more than one annotation with name is attached.