5658 restore accidental change to smlif:identityType

This was an accidental editorial change. I do not anticipate any disagreement on this one. Please reply to indicate whether you agree with the proposal.

>From the bug:
=========

Some editor seems to have swapped the position of baseURI and description
elements within smlif:identityType. This must be accidental change since I do
not recall any WG decision leading to this change. This breaks all existing
SML-IF models.

Proposal:
Change the definition of identityType:

from:
  <xs:complexType name="identityType">
    <xs:sequence>
... ...
      <xs:element name="description" type="smlif:displayType" minOccurs="0"/>
      <xs:element name="baseURI" type="smlif:uriType" minOccurs="0"/>
... ...
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>

to:
  <xs:complexType name="identityType">
    <xs:sequence>
... ...
      <xs:element name="baseURI" type="smlif:uriType" minOccurs="0"/>
      <xs:element name="description" type="smlif:displayType" minOccurs="0"/>
... ...
    </xs:sequence>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>