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,gewith 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, andgeare 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 ofxs: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 thanP1D(one day). |
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