Escape mechanism does not define escaping for "_" character.
Add escaping definition for "_" character.
p. 5122 Part 4/7.4.2.4
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Proposed Disposition of DIS 29500 Comment CZ-0038 (Modified: 2008-01-04) Agreed; the following changes will be made in Part 4, §7.4.2.4, page 5,122, lines 26: This element defines a binary basic string variant type. For all characters that cannot be represented in XML as defined by the XML 1.0 specification, the characters are escaped using the Unicode numerical character representation escape character format _xHHHH_, where H represents a hexadecimal character in the character’s value. [Example: The Unicode character 8 is not permitted in an XML 1.0 document, so it shall be escaped as _x0008_. end example] To store the literal form of an escape sequence, the initial underscore shall itself be escaped (i.e. stored as _x005F_). [Example: The string literal _x0008_ would be stored as _x005F_x0008_. end example] Similar Comments: CA-0065 , CO-0231 , FR-0377 , GB-0592 , GR-0093 , KE-0065 , PT-0114 , US-0162 , VE-0069
