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The value space is the set of integers greater than or equal to 0 and less than or equal to 255.
The lexical space is a finite-length sequence of decimal digits.
<!-- schema -->
<xsd:complexType name="RGB">
<xsd:sequence>
<xsd:element name="red" type="xsd:unsignedByte"/>
<xsd:element name="green" type="xsd:unsignedByte"/>
<xsd:element name="blue" type="xsd:unsignedByte"/>
</xsd:sequence>
</xsd:complexType>
<!-- instance document -->
<red>33</red>
<green>255</green>
<blue>99</blue>
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