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The datatypes covered in this section are shown in Figure The purpose of ISO is to eliminate the risk of confusion between the various date and time formats used in different countries. Date other words, W3C XML Schema does not support these local date and time formats, and imposes daet usage of Xml for any datatype that has the semantic of a date or datf.

While this is a good thing for interchange formats, this is more questionable when XML is used to define user interfaces, since we will see that ISO is not very user friendly. The variations using the names of the months onn different orders between year, month, and day are not the only victims of this decision: ISO imposes the datd of the Gregorian Christian calendar to the exclusion of calendars used by other cultures or religions. ISO describes several formats to define date, times, datf, and recurring dates, with different levels of precision and indetermination.

After many discussions, W3C XML Schema selected a subset of these formats and created a primitive datatype for each format that is supported. The indeterminacy allowed in some of these formats adds a lot xml difficulty, especially when comparisons or arithmetic are involved. For instance, it is possible to define a point in time without specifying the time zone, which is then considered undetermined.

This undetermined time zone is identical om over the document and between the schema and the instance date and it's not an issue to compare two datetimes without a time zone. The problem arises when you need to compare two points in time, one with a time zone xml the other without.

Thus, the support of these datetime datatypes introduces a notion of "partial order relation. Another caveat with ISO is that time zones are only supported through the time difference from UTC, which ignores the notion of summer time. For instance, if an xl working in British Summer Time BST wants to specify the time zone--and we have seen that this is necessary to be able to compare datetimes--the application needs to know if a date is in summer the time zone will be one hour after UTC or in winter the time zone would then be UTC.

ISO ignores the "named time zones" using the summer saving times such as PST, BST, or WET that we use in our day-to-day life; ignoring the time zones can be seen as a somewhat dangerous shortcut to specify that a datetime is on your "local time," whatever it is.

Valid values for xs:dateTime include:. With xnl usage of summer saving time, daet range is subject to national regulations and may change. Despite the indeterminacy of the time zone when none is specified, the W3C XML Schema Recommendation considers that the values of datetimes without time zones implicitly refer to the same undetermined time zone and can be compared between them.

While this is fine for "local" applications that operate in a single time zone, this is a source of potential confusion and errors for world-wide applications or even for applications that calculate a duration between moments belonging to different time saving seasons within a single time zone. These three datatypes are fixed periods of time and optional time zones may be specified for each of them. The only differences between them really are their length 1 day, 1 month, and 1 year and their format i.

The format of xs:gYearMonth is the format of xs:date without the day part. Valid values for xs:gYearMonth include:. The format of xs:gYear is the format of xs:gYearMonth without the month part. Valid values for xs:gYear include:.

This support of time periods is very restrictive: these periods can only xml the Gregorian calendar day, month, or year, and cannot have an arbitrary length or start time. This support of a recurring point in time is also very limited: the recursion period must date a Gregorian calendar day and cannot be arbitrary.

The lexical representation of xs:gDay is DD with xxml optional time zone specification. Valid values for xs:gDay include:. The rules of arithmetic between dates and durations apply in this case, and days are "pinned" in the range for each month.

In our example,the selected dates will be January 31st, Datf 28th or 29thMarch 31st, April 30th, etc. Valid values for xs:gMonthDay include:. The lexical representation of xs:gMonth defined in the Recommendation is --MM-- with an optional time zone specification. It has not been decided yet if the format described in the Recommendation will be forbidden or only deprecated, but it is advised to use the format --MM assuming that the tools you are using already support it.

Valid values for xs:gMonth include:. The lexical space of xs:duration is the format defined by ISO under the form PnYnMnDTnHnMnSin which the capital letters are delimiters that can be omitted when the corresponding member is not used. An important difference with the format used for xs:dateTime is none of these members are mandatory and none of them are restricted to a range.

Xmll gives flexibility to choose the units that will be used and to combine several of them--for instance, P1Y2MTS 1 year, 2 months, and seconds. This flexibility has a price; such a duration is not completely defined: a year may have or days, and a period of two months lasts between 59 and 62 days.

Durations cannot always be compared and the order between durations is partial. We will see, in the next chapter, that user-defined datatypes can be derived from xs:durationwhich can restrict the components used to express durations and insure that these indeterminations do not happen. Since the value date a duration is fixed as soon as you give it a starting point, the schema Working Group has identified four datetimes:. These cause the greatest deviations when durations mixing day, month, and other components are added.

The Working Group has determined that date comparison of durations is undefined if--and only if--the result of the comparison is different when each of these dates is used as a starting point. Valid values xml xs:duration include:. P1M2Y the parts order is significant and Y must precede M. P1Y-1M all parts must be positive. All rights reserved. Datatypes Point in time: xs:dateTime The xs:dateTime datatype defines a "specific instant of time. Xl The value space of xs:dateTime is considered to be the moment of time itself.

Periods of time: xs:datexs:gYearMonth and xs:gYear. The lexical space xml xs:date datatype is identical to the date part of xs:dateTime. Like xs:dateTimeit includes a time zone that should always be date to be able to compare two dates without ambiguity. As defined per W3C XML Schema, a date is a period one day in its time zone, "independent of how many hours this day has.

Another consequence is that, like with xs:dateTimethe order relation between a date with a time zone and a date without a time zone is partial. Recurring point in time: xs:time The lexical space of xs:time is identical to the time part of xs:dateTime.

The semantic of xs:time represents a point in time that recurs every day; the meaning of is "the point in time recurring each day at am. Xml same issue arises when comparing times with and without time zones. NOTE: Despite the fact that: is commonly used to represent a duration of 1 hour, 20 minutes, and 15 seconds, a different format has been chosen to represent a duration. Recurring period of time: xs:gDayxs:gMonthand xs:gMonthDay.

We have already seen points in times and periods, as well as recurring points in time. This wouldn't be complete without a description of recurring periods. W3C Date Schema supports three predefined xml periods corresponding to Gregorian calendar months recurring every year and days recurring each month or year. The support date recurring periods is restricted both in terms of recursion the recursion period can only be a Gregorian zml year or month and period the start time can only be a Gregorian calendar day or month, and the duration can only be a Gregorian calendar month or year.

Since the value of a duration is fixed as soon as you give it a starting point, the schema Working Group has identified four datetimes: TZ TZ TZ TZ These cause the greatest deviations when durations mixing day, month, and other components are added. Numeric Datatypes 4. List Types.

регистрация для знакомства на сайте с бисексуалами › orelly › xml › schema. The support for date and time datatypes relies entirely on a subset of the ISO standard, which is the only format supported by W3C XML Schema. This step-by-step article describes how to format DateTime and Date values in the XML that is extracted from an DataSet object.