Images

An image will be mapped to the static Image field object in the form design. Here are the attributes:

xfa:contentType 
xfa:href 
xfa:transferEncoding

Here is an example of such a declaration:

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
        xmlns:xfa="http://www.adobe.com/2003/xfa"> 
<xsd:import namespace="http//www.adobe.com/2003/xfa"> 
<xsd:element name="ImageField"> 
    <xsd:complexType> 
        <xsd:extension base="xsd:hexBinary"> 
            <xsd:attribute ref="xfa:contentType" fixed="image/jpg"/> 
            <xsd:attribute ref="xfa:transferEncoding" fixed="base64"/> 
        </xsd:extension> 
    </xsd:simpleContent> 
    </xsd:complexType> 
</xsd:element>

In this case, the attributes will not be used to generate fields in the form design. They will be used to recognize the element as corresponding to an image field, and any default or fixed values for the attributes will be set on the generated <image> element.