Lectionary for Mass: For Use in the Dioceses of the United States of America. Second Typical Edition lack the datatype and index for the most common reference to it - the reading set number which is used in the ordo to specify the readings. It should appear in at least three locations:
1. as a datatype (search, information, context menu)
2. as an index to the resource
3. as an attribute in the {Label Lectionary Reading} syntax
