Specifies a W3C schema whose elements and attributes are to be mapped to the cells in the spreadsheet.
| Namespace | http://schemas.microsoft.com/office/excel/2003/xml | 
| Schema name | XML Spreadsheet 2003 | 
None.
| Attribute | Type | Required | Description | Possible Values | 
|---|---|---|---|---|
| ID | xsd:string | required | Specifies a unique ID for a W3C schema. | See external namespace. | 
| Namespace | xsd:string | required | Specifies the namespace to be used with a schema. | See external namespace. | 
| SchemaRef | xsd:string | optional | Contains the ID for any XML Spreadsheet 2003 schema element that holds a W3C schema that this schema imports. | See external namespace. | 
      
<xsd:complexType name="SchemaType" >
  <xsd:sequence>
    <xsd:any processContents="skip" maxOccurs="unbounded" />
  </xsd:sequence>
  <xsd:attribute name="ID" type="xsd:string" use="required">
  </xsd:attribute>
  <xsd:attribute name="Namespace" type="xsd:string" use="required">
  </xsd:attribute>
  <xsd:attribute name="SchemaRef" type="xsd:string" use="optional">
  </xsd:attribute>
</xsd:complexType>