Inconsistency between text and XSD on multiplicity of eb:Property children

In section 5.2.2.11 on the eb:Messaging/eb:UserMessage/eb:MessageProperties element it is stated that:
"This element has zero or more eb:Property child elements."

The definition of this element in the xml schema is:

<xsd:element name="MessageProperties" type="MessageProperties"/>
<xsd:complexType name="MessageProperties">
<xsd:sequence>
<xsd:element name="Property" type="Property" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>

This definition requires the Property element to occur at least once creating an inconsistency with the specifications text.