Resolution:
As per the specification at http://www.w3.org/TR/xmlschema-2/#decimal:

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3.2.3.1 Lexical representation

Decimal has a lexical representation consisting of a finite-length sequence of decimal digits (#x30-#x39) separated by a period as a decimal indicator. An optional leading sign is allowed. If the sign is omitted, "+" is assumed. Leading and trailing zeroes are optional. If the fractional part is zero, the period and following zero(es) can be omitted. For example: -1.23, 12678967.543233, +100000.00, 210.

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Decimal cannot accept data in scientific notation. To receive scientific notation, use "xsd:float" or "xsd:double" instead of xsd:decimal.