<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="packages:label"/>
<xs:element ref="packages:icon"/>
+ <xs:element ref="packages:metadata"/>
<xs:element ref="packages:support-size"/>
</xs:choice>
<xs:any minOccurs="0" maxOccurs="unbounded" namespace="##any" processContents="lax"/>
<xs:attribute name="exec" use="required"/>
<xs:attribute name="main" type="xs:boolean"/>
<xs:attribute name="update-period" type="xs:nonNegativeInteger"/>
+ <xs:attribute name="max-instance" type="xs:nonNegativeInteger"/>
<xs:attribute name="preview" type="xs:string"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>