XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition (353 page)

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Authors: Michael Kay

BOOK: XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition
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xs:gYear
xs:gYearMonth
xs:gMonth
xs:gMonthDay
xs:gDay
xs:QName
xs:base64Binary
xs:hexBinary
xs:NOTATION
These types have no ordering defined. Using any of the operators
lt
,
le
,
gt
,
ge
with values of these types is a type error. There's no particular reason for this restriction—in most of these cases it would have been quite possible to define a useful ordering—but the working groups decided it wasn't needed.
xs:duration
xs:duration
values themselves are not considered to be ordered, so the operators
lt
,
le
,
gt
, and
ge
are not available. This removes the problem of deciding whether 30 days is less than, equal to, or greater than one month. The two XPath subtypes of
xs:duration
, namely
xs:yearMonthDuration
and
xs:dayTimeDuration
, are much more well behaved. The effect of comparing them is the same as converting the value to a number of months, or a number of seconds, and comparing the two numbers. This means, for example, that
PT36H
(36 hours) is greater than
P1D
(one day).

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