[XERCESJ-1592] schema validation incorrectly treating single character outside of BMP as two characters

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.11.0
• Fix Version/s: 2.12.0
• Component/s: XML Schema 1.0 Datatypes
• Environment: Windows 7, Oracle Java JRE 1.7
• Assignee: Unassigned
• Reporter: Martin Honnen
• Created: 12/Oct/12 11:40
• Updated: 12/May/21 19:10
• Resolved: 12/Oct/12 12:25

Description

When validating the instance document http://home.arcor.de/martin.honnen/xml/oneCharInstance1.xml against the schema http://home.arcor.de/martin.honnen/xml/oneCharSchema1.xsd Xerces reports the following validation error(s):

"[Error] oneCharInstance1.xml:3:25: cvc-length-valid: Value '?' with length = '2'
is not facet-valid with respect to length '1' for type 'one-char'.
[Error] oneCharInstance1.xml:3:25: cvc-type.3.1.3: The value '?' of element 'test' is not valid."

The "test" element however contains a single character (<test>𐌀</test>), albeit one which is not inside the BMP. In terms of the XML specification http://www.w3.org/TR/xml/#dt-character and the schema data type specification http://www.w3.org/TR/xmlschema-2/#string there is no difference between characters in the BMP and outside of it, each one counts as a single character.

So the sample XML is valid against the sample schema and Xerces should not report any error.

Other validating parsers like Saxon 9.4 EE and XSV (http://www.w3.org/2001/03/webdata/xsv?docAddrs=http%3A%2F%2Fhome.arcor.de%2Fmartin.honnen%2Fxml%2FoneCharInstance1.xml+http%3A%2F%2Fhome.arcor.de%2Fmartin.honnen%2Fxml%2FoneCharSchema1.xsd&warnings=on&keepGoing=on&style=xsl#) don't report any validation error for the samples named above.