RELAX NG by Eric van der Vlist will be published by O'Reilly & Associates (ISBN: 0596004214)
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xsd:double — IEEE 64 bit floating point.
xsd:anySimpleType
xsd:double
none
enumeration, maxExclusive, maxInclusive, minExclusive, minInclusive, pattern.
<xsd:simpleType name="double" id="double">
<xsd:restriction base="xsd:anySimpleType">
<xsd:whiteSpace value="collapse" fixed="true"/>
</xsd:restriction>
</xsd:simpleType>
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The value space of xsd:double is "double" (64 bits) floating-point numbers as defined by the IEEE (Institute of Electrical and Electronic Engineers). The lexical space uses a decimal format with optional scientific notation. The match between lexical (powers of 10) and value (powers of 2) spaces is approximate and done on the closest value.
This datatype differentiates positive (0) and negative (-0) zeros, and includes the special values "-INF" (negative infinity), "INF" (positive infinity) and "NaN" (Not a Number).
Note that the lexical spaces of xsd:float and xsd:double are exactly the same; the only difference is the precision used to convert the values in the value space.
The decimal separator is always a point (".") and no thousands separator may be used.
Valid values include: "123.456", "+1234.456", "-1.2344e56", "-.45E-6", "INF", "-INF", or "NaN".
The following values would be invalid: "1234.4E 56" (spaces are forbidden), "1E+2.5" (the power of 10 must be an integer), "+INF" (positive infinity doesn't expect a sign), or "NAN" (capitalization matters in special values).
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All text is copyright Eric van der Vlist, Dyomedea. During development, I give permission for non-commercial copying for educational and review purposes. After publication, all text will be released under the Free Software Foundation GFDL.