Consistency: This is followed by ...

The general style for properties is:

948 17 (0x11) Byte, Identifier of the Session Expiry Interval.
949 Followed by the Four Byte integer representing the Session Expiry Interval in seconds.

but there are other cases which use "This is"

1140 38 (0x26) Byte, Identifier of the User Property. This is followed by a UTF-8 string pair.

1820 38 (0x26) Byte, Identifier of the User Property. This is followed by a UTF-8 string pair.