Validator reports constraint exceeded for gradientFill stop

[Themanwithoutaplan]

The validator reports an error for the following style definition:

  <x:fill>
    <x:gradientFill type="linear" degree="90">
      <x:stop position="0">
        <x:color theme="0" />
      </x:stop>
      <x:stop position="1">
        <x:color theme="4" />
      </x:stop>
      <x:stop position="2">
        <x:color rgb="00FF0000" />
      </x:stop>
    </x:gradientFill>
  </x:fill>

I can't find the matching constraint. This is specification for a gradientFill:

<xsd:complexType name="CT_GradientFill">
    <xsd:sequence>
       <xsd:element name="stop" type="CT_GradientStop" minOccurs="0" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="type" type="ST_GradientType" use="optional" default="linear"/>
    <xsd:attribute name="degree" type="xsd:double" use="optional" default="0"/>
    <xsd:attribute name="left" type="xsd:double" use="optional" default="0"/>
    <xsd:attribute name="right" type="xsd:double" use="optional" default="0"/>
    <xsd:attribute name="top" type="xsd:double" use="optional" default="0"/>
    <xsd:attribute name="bottom" type="xsd:double" use="optional" default="0"/>
</xsd:complexType>
<xsd:complexType name="CT_GradientStop">
    <xsd:sequence>
       <xsd:element name="color" type="CT_Color" minOccurs="1" maxOccurs="1"/>
    </xsd:sequence>
    <xsd:attribute name="position" type="xsd:double" use="required"/>
</xsd:complexType>

If I understand this correctly then there can be an unlimited number of stops. Any limits could be imposed using the maxOccurs attribute of the fill.

[twsouthwick]

@tomjebo Can you take a look at this?

[twsouthwick]

Here's a repro:

            var xml = @"  <x:fill xmlns:x=""http://schemas.openxmlformats.org/spreadsheetml/2006/main"">
    <x:gradientFill type=""linear"" degree=""90"">
      <x:stop position=""0"">
        <x:color theme=""0"" />
      </x:stop>
      <x:stop position=""1"">
        <x:color theme=""4"" />
      </x:stop>
      <x:stop position=""2"">
        <x:color rgb=""00FF0000"" />
      </x:stop>
    </x:gradientFill>
  </x:fill>";
            var fill = new Fill(xml);

            var validator = new OpenXmlValidator();
            var results = validator.Validate(fill);

            Assert.Empty(results);

I get the following error:

Description="The attribute 'position' has invalid value '2'. The MaxInclusive constraint failed. The value must be less than or equal to 1."

The semantic validation (not in the schema) constrains the value of position between 0 and 1.