An instance of this class holds one or more daily note sets.
To create a BirdNoteSet object, you will
need a Txny instance that defines your preferred
taxonomic arrangement:
T
BirdNoteSet(T)
Attributes of the instance include:
.txny
As passed to the constructor.
.period
The period title, having the form
“monthName
year”. Initially an empty
string. After you read an XML file into the
instance with the .readFile()
method, this attribute will contain the period name
from that set.