.the property is hidden from serializtion in the
_separator is used either to separate words or to qualify the property with a prefix ala namespace.
.separator is usually used to denote some sort of hierarchy. The first part might be the name of the service or or module as in “frei0r,” for example. Or, it might refer to a nested object such as “transition.” when a filter contains a transition to do some of its work.
meta.is special and means it contains metadata. Producer properties that have this prefix are automatically copied to the frames it generates.
set.is special. Producer properties that have this prefix are automatically copied to the frames it generates, but the
set.prefix is stripped from the frame’s property name.
consumer.means this is a consumer property that should be copied to the frames so the services can see them.
.as a delimiter.