XML schema validation and pattern errors

I have a problem validating a perfectly valid XML with it's schema file in Ruby. It works OK on my development machine (OS X 10.6) but fails everytime on the production system (Debian 4.1).

The part of the XML that gives errors is this:

<ROUNDINGS>-0.02</ROUNDINGS>

And the XSD pattern is this:

<xsd:element name="ROUNDINGS">
  <xsd:simpleType>
    <xsd:restriction base="xsd:string">
      <xsd:pattern value="([+-]?(\d{0,1}\.\d{0,2})|[ ])*"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:element>

Command run (nokogiri):

Nokogiri::XML::Schema(File.read("schema.xsd")).validate(Nokogiri::XML(File.read("roundings.xml")))

and error output:

[#<Nokogiri::XML::SyntaxError: Element 'ROUNDINGS': [facet 'pattern'] The value '-0.02' is not accepted by the pattern '([+-]?(\d{0,1}\.\d{0,2})|[ ])*'.>, #<Nokogiri::XML::SyntaxError: Element 'ROUNDINGS': '-0.02' is not a valid value of the local atomic type.>]

Command run (libxml-ruby):

XML::Document.file("roundings.xml").validate_schema(XML::Schema.from_string(File.read("schema.xsd")))

and error output:

Error: Element 'ROUNDINGS': [facet 'pattern'] The value '-0.02' is not accepted by the pattern '([+-]?(\d{0,1}\.\d{0,2})|[ ])*'. at roundings.xml:232.
Error: Element 'ROUNDINGS': '-0.02' is not a valid value of the local atomic type. at roundings.xml:232.

I'm using libxml-ruby 1.1.3 and nokogiri 1.4.3.1 on Ruby 1.8.6

As the problem is the same for both libraries, it seems that the validation is done using some system library that has a problem?

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XML schema validation and pattern errors

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