There are three possible values for the Tera-specific extra attribute gs:size: Main, Aux and Ext. These are defined as follows:
<xs:attribute name="size" type="tNonNegativeLong" gs:compute="true" gs:size="Main" gs:dimension="datasize:byte">
<xs:annotation>
<xs:appinfo>
<gs:ui mode="Hidden"/>
</xs:appinfo>
<xs:documentation>Object 'main' size: the size in bytes of the image data</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="auxSize" type="tNonNegativeLong" gs:compute="true" gs:size="Aux" gs:dimension="datasize:byte">
<xs:annotation>
<xs:appinfo>
<gs:ui mode="Hidden"/>
</xs:appinfo>
<xs:documentation>Object 'auxiliary' size: the size in bytes of the image thumbnail</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="extSize" type="tNonNegativeLong" gs:compute="true" gs:size="Ext" gs:dimension="datasize:byte">
<xs:annotation>
<xs:appinfo>
<gs:ui mode="Hidden"/>
</xs:appinfo>
<xs:documentation>Object 'extended' size: the size in bytes of the image preview</xs:documentation>
</xs:annotation>
</xs:attribute>
These sizes correspond to the calculation of the MaxSize, MaxAuxSize and MaxExtSize defined in a quota.
See also