In writing this section, I've come across a few issues that I'd like some opinions on.

PictureType.  At one point, the Architecture WG had discussed not implementing this data type because it was not different enough from GraphicType to warrant a separate data type.  If a user had a picture, they should just use GraphicType.  What do you think?  Keep PictureType or remove it from the OAGIS implementation?

BinaryObject - MimeCode Supplementary Component.  In the ATG2 NDR, it designates this attribute as required.  I have two questions here.  1) should it be required? and 2) if it is required, are some of the other supplementary components relevant (e.g. encoding code, format)?

RateType.  I'd like to recommend that we do not implement this data type because I don't think there is a globally accepted definition or use of this term.  For example, when I think of rate, I think of something like "rate of acceleration" or "rate of descent" which would be expressed as [number uom/uom] (50 miles/hour).  Do you agree?

ValueType.  I'd also like to recommend that OAGIS not implement this data type.  The argument is not as clear as with RateType, but I question whether there is enough distinction between NumericType and ValueType to justify ValueType.

TextType - LanguageLocaleIdentifier SupplementaryComponent.  I understand what this is and how it may be useful in certain situations but I do not know of any real cases where this is actually used.  Furthermore, a colleague pointed out that the built-in XML Schema type xsd:language is based on RFC 1766 and not ISO 639.  If you read RFC 1766 (http://www.ietf.org/rfc/rfc1766.txt), you will notice that the concept of language locale is included in the language representation.  Therefore, from a technical XML Schema perspective, LanguageLocaleIdentifier is not necessary.

IdentifierType.  The ATG2 NDR only uses two of the possible seven supplementary components available for this data type - IdentificationSchemeDataURI and IdentificationSchemeURI.  I don't understand why the other supplementary components were excluded and believe they would be useful in many situations.  Do you agree and if yes, do you have any recommendations about which of the Identifier supplementary components should or should not be used?

Thanks,

garret