Update for development version 1.2.4-DEV
trac/218: incorrect rich comparisons for _PluralBinding

None remains strictly less than all non-None instances.  The derived
comparisons are defined in terms of __lt__ and unlike
functools.total_ordering do not support derivation from __le__.
trac/219: append with mixed content creates unbound ElementContent

This occured only with wildcards, and was due to too lax filtering of
unrecognized values.  Only material that has enough information identify
an element may be added as a wildcard.  Other material may be accepted
as mixed content, if the type permits this.
opengis: add oseo 1.0 and wps 1.0.0 bindings
trac/221: forward to _CF_enumeration helper methods in enumeration_mixin

Do this without intruding any further on the namespace reserved for the
user in the simpleType class that inherits the mixin.
test-trac-0221: validate against legacy and parsed document values
test-trac-0221: verify traditional approach works as intended
IncrementalElementContentError: fix diagnostic reference

The value in the exception may not be a typed value instance, e.g. when
it is an xml.dom.Node.  Avoid invoking non-existing methods in that
case.
manual: remove unreferenced source file
to_xml: provide override for values without an element binding

Pass through an element name to be used when the object instance was
created through a type class directly instead of through an element
instance.
manual: fix fallout from #203 change

Updates the manual examples so they reflect how PyXB works.
trac/224: GetDOMImplementation failure when cssutils installed

DOM implementations are not obligated to support Core DOM interfaces, or
even XML.  Supply the features PyXB requires.  Verified with an external
application that loads cssutils (which registers an incomplete DOM
implementation) before invoking PyXB operations.
test-constraints: use string literals for decimal-based tests

Precision is lost by using floating point literals, resulting in
failures to be equal to the floating point value when trac/91 is fixed.
test-constraints: verify lexical space for xsd:decimal conversion

When converting from value space to lexical space, leading and trailing
zeroes are not permitted except immediately adjacent to decimal point,
which is required.  A positive sign symbol is not permitted.
tests: retrofit support for Python 2.6

Context manager for assertion failures wasn't present in 2.6, and I want
the test suite to pass cleanly due to other 2.6/2.7 workarounds in the
fix for trac/91.
trac/91: Problem with fractionDigits violation

Change the value type for xs:decimal to be decimal.Decimal from its
former type of types.FloatType.  This should make PyXB conformant with
xs:decimal in terms of the totalDigits and fractionDigits constraining
facets.

This is an interface change: some arithmetic operations between
datatypes.decimal and Python floats are now likely to fail.
cablelabs: disable example due to unavailable schema

The schema are apparently no longer publicly available.
decimal: treat non-zero non-normal values as invalid

These cannot be expressed in the lexical space for XML schema.
blockfinal.xsd: element final disallows value "substitution"
enumerations.xsd: facet restriction must apply to derived type