The topics included in an FTML map inherit the map's metadata. In the same way, child topics inherit metadata from their parent topics. If a topic inherits metadata that it already had, the topic takes on both values (its own and the inherited one).
In all cases, metadata keys beginning with the prefix ft:
is not inherited. This includes the following metadata keys:
ft:title
ft:locale
ft:baseId
ft:clusterId
ft:openMode
ft:originUrl
ft:editorialType
ft:lastEdition
ft:description
ft:prettyUrl
Example
A topic has the metadata product=foo
and inherits the metadata product=bar
from the document. As a result, its new metadata is product=foo,bar
.