Remaining work
- Look at the relation between TaggedComponents and Codecs.
- Add TaggedComponentFactories to ORB init
- look at PI and codecs
- Implement PoliciesComponent

=====================
Testing:
Tagged Components: (DONE)
    General:
	- Constructed data can be retrieved
	- read and written correctly as part of IOR
	  (test this first in IdEncapsulationContainerBase test)
    AlternateIIOPAddressComponent:
	- can correctly write out TCP port >32K
    CodeSetsComponent
	- none additional
    JavaCodebaseComponent
	- none additional
    ORBTypeComponent
	- none additional
    PoliciesComponent
	- none additional

IdentifiableContainerBase (DONE)
    - Test iteratorById on Identifiables (DONE)
	- Iterator on id not present is empty (hasNext() == false)
	- Iterator on id present returns all ids in sequence
IdEncapsulationContainerBase  (DONE)
    - Test read sequence of TaggedComponents
    - Test writing sequence of TaggedComponents
GenericIdEncapsulation (DONE)
    - Test by using for tagged profile and tagged component
    - write out and read back test
IIOPAddress (DONE)
    - Constructed object returns correct values
    - equals:
	- false for non-IIOPAddress value
	- true iff ports and hosts match
IIOPProfile (DONE)
    - construct from id, template; check that correct values are returned
    - write out and read back
	- no components for 1.0
	- components for >1.0
    - getObjectKey returns value constructed correctly
    - isEquivalent iff ids equal and templates equivalent
IIOPProfileTemplate (DONE)
    - Constructed object contains correct values
    - isEquivalent iff address and template are equal
    - cannot have new components added after makeImmutable call
IOR (DONE)
    - Constructed object contains correct values
	- IOR() has null typeid and no profiles (DONE)
	- IOR( String ) has given typeid and no profiles (DONE)
	- IOR( String, IIOPProfileTemplate, ObjectId ) has given typeid and
          one IIOPProfile corresponding to template and objectid
	- IOR( String, IORTemplate, ObjectId ) has profiles corresponding to
	  IORTemplate and ObjectIds. (DONE)
	- IORTemplate( String, IORTemplate, ObjectIds ) has profiles
	  corresponding to IORTemplate and ObjectIds (DONE)
	- IOR( IORTemplate, ObjectIds ) usual test (DONE)
    - write out/read back test (DONE)
	- Construct IOR with 2 IIOPProfiles, each with several components,
	  and 2 GenericIdEncapsulation profiles, write out, read back,
	  check for equals directly and by calling equals
    - cannot have new profiles added after makeImmutable call (DONE)
    - contained IIOPProfiles cannot have added components after
      makeImmutable call. (DONE)
IORTemplate (DONE)
    - Constructed object contains correct value
JIDLObjectKeyTemplate (DONE)
    - test that IDs match expected values when created from
      byte[] in ObjectKeyFactory.create
    - Constructed object contains correct values
    - write out and read back test
    - getId correctly extract id from key
FreezableList (DONE)
    - ASSUME that it acts like a linked list: don't test entire interface
    - all modification operations throw UnsupportedOperationException
      after makeImmutable call
    - all iterators (whether created before or after makeImmutable call)
      throw U.O.E. after makeImmutable
ObjectId (DONE)
    - constructed object returns same id
    - test cases in equals
ObjectKey (DONE)
    - constructed object returns same id, template
    - write/read test
    - getBytes returns correct value (test by using factory and
      comparing)
ObjectKeyFactory (DONE)
    - test create with hand created keys
	- key length < 4
	- key length >= 4
	    - magic is JAVAMAGIC
		- scid is POA scid
		- scid is JIDL scid
		- other scid
	    - magic is not JAVAMAGIC
    - test with error cases on length
POAObjectKeyTemplate (DONE)
    - test that IDs match expected values when created from
      byte[] in ObjectKeyFactory.create
    - test that IDs match when created with explicit values
    - write out and read back test
    - getId correctly extracts id from key
TaggedComponentFactories (DONE)
    - only tested inditectly by reading and writing IIOPProfileTemplate
      that contains all components
TaggedComponentFactoryFinder (DONE)
    - registered factory can be looked up
    - lookup of unregistered factory returns null
    - reads tagged component from stream as correct type if registered
    - reads tagged component from stream as generic if not registered
TaggedProfileFactoryFinder (DONE)
    - reads IIOP profile as IIOPProfile
    - reads others as Generic
WireObjectTemplate (DONE)
    - getId returns entire key as id
    - serverId is -1
    - write out and read back test

Interfaces (no tests):
    IdEncapsulation
    IdEncapsulationFactory
    IdEncapsulationFactoryFinder
    Identifiable
    ObjectKeyTemplateo
    ObjectKeyTemplate
    TaggedComponent
    TaggedProfile
    TaggedProfileTemplate
    Writeable
    
Trivial classes:
    ObjectIds