Looking at this comprehensive list gives you an idea of the level of granularity in XML. There is a data specification for everything, even spaces!
| String Data Types | ||||
| Data Type | Description | |||
| xs:string | A text string containing all legal characters from the ISO/IEC character set, including all white space characters | |||
| xs:normalizedString | A text string in which all white space characters are replaced with blank spaces | |||
| xs:token | A text string in which blank spaces are replaced with a single blank space; opening and closing spaces are removed | |||
| xs:NMTOKEN | A text string containing valid XML names with no white space | |||
| xs:NMTOKENS | A list of NMTOKEN data values separated by white space | |||
| xs:Name | A text string similar to the NMTOKEN data type except that names must begin with a letter or the character ":" or "-" | |||
| xs:NCName | A "noncolonized name," derived from the Name data type but restricting the use of colons anywhere in the name | |||
| xs:ID | A unique ID name found nowhere else in the instance document | |||
| xs:IDREF | A reference to an ID value found in the instance document | |||
| xs:IDREFS | A list of ID references separated by white space | |||
| xs:ENTITIY | A value matching an unparsed entity defined in a DTD | |||
| xs:ENTITIES | A list of entity values matching an unparsed entity defined in a DTD | |||
| Numeric Data Types | ||||
| Data Type | Description | |||
| xs:decimal | A decimal number in which the decimal separator is always a dot (.) with a leading + or - character allowed; no non-numeric characters are allowed, nor is exponential notation | |||
| xs:integer | An integer | |||
| xs:nonPositiveInteger | An integer less than or equal to zero | |||
| xs:negativeInteger | An integer less than zero | |||
| xs:nonNegativeInteger | An integer greater than or equal to zero | |||
| xs:positiveInteger | An integer greater than zero | |||
| xs:float | A floating point number allowing decimal values and values in scientific notation; infinite values can be represented by -INF and INF, non-numeric values can be represented by NaN | |||
| xs:double | A double precision floating point number | |||
| xs:boolean | A boolean value that has the value true, false, 0, or 1 | |||
| Date and time data types | ||||
| Data Type | Description | |||
| xs:datetime | A date and time entered in the format yyyy-mm-ddThh:mm:ss where yyyy is the four-digit year, mm is the two-digit month, dd is the two-digit day, T is the time zone, hh is the two-digit hour, mm is the two-digit minute, and ss is the two-digit second | |||
| xs:datetime | A date entered in the format yyyy-mm-dd | |||
| xs:time | A time entered in the format hh:mm:ss | |||
| xs:gYearMonthDay | A date based on the Gregorian calendar entered in the format yyyy-mm-dd (equivalent to xs:date) | |||
| xs:gYearMonth | A date entered in the format yyyy-mm (no day is specified) | |||
| xs:gYear | A year entered in the format yyyy | |||
| xs:gMonthDay | A month and day entered in the format --mm-dd | |||
| xs:gMonth | A month entered in the format --mm | |||
| xs:gDay | A day entered in the format ---dd | |||
| xs:duration | A time duration entered in the format PyYmMdDhHmMsS where y, m, d, h, m, and s are the duration values in years, months, days, hours, minutes, and seconds; an optional negative sign is also permitted to indicate a negative time duration. | |||