mule.xsd fails schema validation by strict validator

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http://www.mulesoft.org/schema/mule/core/3.2/mule.xsd
>> Engine name: Saxon-EE 9.3.0.5
>> Severity: fatal
>> Description: Error at character 2 in regular expression
>> "(#[[^\]]+]|\${[^\}]+})": invalid escape sequence Start
>> location: 6884:63

It seems that this validation error is reported because "#" and "$"
characters shouldn't be escaped in the regexp expression as per the specification of the XML Schema:
http://www.w3.org/TR/xmlschema-2/#cces
All the valid escaped characters can be found there (you can see that neither "#" nor "$" is in the list).

It seems that the Xerces parser is a lot more flexible in this regard and allows it, while Saxon doesn't.

the expression should be:
<xsd:pattern value="(#[[^\]]+]|${[^\}]+})"/>

(With thanks to oXygen XML Editor Support [support@oxygenxml.com] )