2.2.1 [W3C-XSD] Section 3.2.6.2, Order relation on duration

  • Article

V0011:

The specification states:

 In general, the ·order-relation· on duration is a partial order since there is 
 no determinate relationship between certain durations such as one month (P1M) and 
 30 days (P30D). The ·order-relation· of two duration values x and y is x < y iff 
 s+x < s+y for each qualified dateTime s in the list below. These values for s 
 cause the greatest deviations in the addition of dateTimes and durations. Addition 
 of durations to time instants is defined in Adding durations to dateTimes (§E).

MSXML6

Some comparisons that are indeterminate are considered to be true, such as the comparison between 1 month and 30 days.