close stream-name indexer? (and stream-name indexer?)*
close action explicitly closes a stream. Once a stream that is attached to a file, buffer, referent, markup parser, or external string sink function has been closed, the same stream name can be used to open another attachment.
Streams don't normally need to be closed because:
openis performed on the stream variable.
Several streams can be closed at once.
It is an error to close a stream that is part of any
#current-output for any currently open rule or function.
The following syntactic variation is permitted: