A sample XML schema for classifying objects in SketchUp

sketchup_sample_schema.xml

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">

  <xs:element name="Furniture">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="Manufacturer" type="xs:string" />
        <xs:element name="Cost" type="xs:string" />
        <xs:element name="Type" minOccurs="0">
          <xs:simpleType>
            <xs:restriction base="xs:string">
              <xs:enumeration value="Table" />
              <xs:enumeration value="Chair" />
              <xs:enumeration value="Shelving" />
            </xs:restriction>
          </xs:simpleType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name="Lighting" />

</xs:schema>