season attributes other than seasonNumber should be optional in schema2.xsd

[vsagarv]

While running pubrss-2-amgrss, the test input e67004c-0.xml fails validation with the following error:

failed validating <Element '{http://www.amagi.com/amgrss/}season' at 0x1083f14e0> with Xsd11Group(model='sequence', occurs=[1, 1]):

Reason: The content of element 'tns:season' is not complete. Tag 'tns:seasonTitle' expected.

schema2.xsd expects seasonTitle, seasonThumbnail and broadcastDate to be present for all instances of . However, a season with seasonNumber alone is viable. For example, the following season in e67004c-0.xml:

            <seasonNumber>1</seasonNumber>

gets converted to an intermediate pubrss-2-amgrss output xml as follows:

         <amg:season>
            <amg:seasonNumber>1</amg:seasonNumber>
         </amg:season>

I think the above season specification should pass validation. Hence, I propose minOccurs = 0 and maxOccurs = 1 for the following season attributes:

        <xs:element name="seasonTitle" minOccurs="0" maxOccurs="1" type="tns:myString" />
        <xs:element name="seasonThumbnail" minOccurs="0" maxOccurs="1" type="tns:myString" />
        <xs:element name="broadcastDate" minOccurs="0" maxOccurs="1" type="xs:gYear" />