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Next release
------------
Bug Fixes
~~~~~~~~~
- Work around a regression in Python 3.3 for ``colander.Decimal`` when it's
used with a ``quant`` argument but without a ``rounding`` argument.
See https://github.com/Pylons/colander/issues/66
Features
~~~~~~~~
- Add ``colander.Set`` type, ported from ``deform.Set``
- Add Python 3.3 to tox configuration and use newer tox testing regime
(setup.py dev).
- Calling ``bind`` on a schema node e.g. ``cloned_node = somenode.bind(a=1,
b=2)`` on a schema node now results in the cloned node having a
``bindings`` attribute of the value ``{'a':1, 'b':2}``.
- It is no longer necessary to pass a ``typ`` argument to a SchemaNode
constructor if the node class has a ``schema_type`` callable as a class
attribute which, when called with no arguments, returns a schema type.
This callable will be called to obtain the schema type if a ``typ`` is not
supplied to the constructor. The default ``SchemaNode`` object's
``schema_type`` callable raises a ``NotImplementedError`` when it is
called.
- SchemaNode now has a ``raise_invalid`` method which accepts a message and
raises a colander.Invalid exception using ``self`` as the node and the
message as its message.
- It is now possible and advisable to subclass ``SchemaNode`` in order to
create a bundle of default node behavior. The subclass can define the
following methods and attributes: ``preparer``, ``validator``, ``default``,
``missing``, ``name``, ``title``, ``description``, ``widget``, and
``after_bind``.
For example, the older, more imperative style that looked like this still
works, of course::
from colander import SchemaNode
ranged_int = colander.SchemaNode(
validator=colander.Range(0, 10),
default = 10,
title='Ranged Int'
)
But you can alternately now do something like this::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
validator = colander.Range(0, 10)
default = 10
title = 'Ranged Int'
ranged_int = RangedInt()
Values that are expected to be callables can now alternately be methods of
the schemanode subclass instead of plain attributes::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
default = 10
title = 'Ranged Int'
def validator(self, node, cstruct):
if not 0 < cstruct < 10:
raise colander.Invalid(node, 'Must be between 0 and 10')
ranged_int = RangedInt()
Note that when implementing a method value such as ``validator`` that
expects to receive a ``node`` argument, ``node`` must be provided in the
call signature, even though ``node`` will almost always be the same as
``self``. This is because Colander simply treats the method as another
kind of callable, be it a method, or a function, or an instance that has a
``__call__`` method. It doesn't care that it happens to be a method of
``self``, and it needs to support callables that are not methods, so it
sends ``node`` in regardless.
You can't currently use *method* definitions as ``colander.deferred``
callables. For example this will *not* work::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
default = 10
title = 'Ranged Int'
@colander.deferred
def validator(self, node, kw):
request = kw['request']
def avalidator(node, cstruct):
if not 0 < cstruct < 10:
if request.user != 'admin':
raise colander.Invalid(node, 'Must be between 0 and 10')
return avalidator
ranged_int = RangedInt()
bound_ranged_int = ranged_int.bind(request=request)
This will result in::
TypeError: avalidator() takes exactly 3 arguments (2 given)
However, if you treat the thing being decorated as a function instead of a
method (remove the ``self`` argument from the argument list), it will
indeed work)::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
default = 10
title = 'Ranged Int'
@colander.deferred
def validator(node, kw):
request = kw['request']
def avalidator(node, cstruct):
if not 0 < cstruct < 10:
if request.user != 'admin':
raise colander.Invalid(node, 'Must be between 0 and 10')
return avalidator
ranged_int = RangedInt()
bound_ranged_int = ranged_int.bind(request=request)
In previous releases of Colander, the only way to defer the computation of
values was via the ``colander.deferred`` decorator. In this release,
however, you can instead use the ``bindings`` attribute of ``self`` to
obtain access to the bind parameters within values that are plain old
methods::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
default = 10
title = 'Ranged Int'
def validator(self, node, cstruct):
request = self.bindings['request']
if not 0 < cstruct < 10:
if request.user != 'admin':
raise colander.Invalid(node, 'Must be between 0 and 10')
ranged_int = RangedInt()
bound_range_int = ranged_int.bind(request=request)
If the things you're trying to defer aren't callables like ``validator``,
but they're instead just plain attributes like ``missing`` or ``default``,
instead of using a ``colander.deferred``, you can use ``after_bind`` to set
attributes of the schemanode that rely on binding variables::
from colander import SchemaNode
class UserIdSchemaNode(SchemaNode):
title = 'User Id'
def after_bind(self, node, kw):
self.default = kw['request'].user.id
You can override the default values of a schemanode subclass in its
constructor::
from colander import SchemaNode
class RangedIntSchemaNode(SchemaNode):
default = 10
title = 'Ranged Int'
validator = colander.Range(0, 10)
ranged_int = RangedInt(validator=colander.Range(0, 20))
In the above example, the validation will be done on 0-20, not 0-10.
If a schema node name conflicts with a schema value attribute name on the
same class, you can work around it by giving the schema node a bogus name
in the class definition but providing a correct ``name`` argument to the
schema node constructor::
from colander import SchemaNode, Schema
class SomeSchema(Schema):
title = 'Some Schema'
thisnamewillbeignored = colander.SchemaNode(
colander.String(),
name='title'
)
Note that such a workaround is only required if the conflicting names are
attached to the *exact same* class definition. Colander scrapes off schema
node definitions at each class' construction time, so it's not an issue for
inherited values. For example::
from colander import SchemaNode, Schema
class SomeSchema(Schema):
title = colander.SchemaNode(colander.String())
class AnotherSchema(SomeSchema):
title = 'Some Schema'
schema = AnotherSchema()
In the above example, even though the ``title = 'Some Schema'`` appears to
override the superclass' ``title`` SchemaNode, a ``title`` SchemaNode will
indeed be present in the child list of the ``schema`` instance
(``schema['title']`` will return the ``title`` SchemaNode) and the schema's
``title`` attribute will be ``Some Schema`` (``schema.title`` will return
``Some Schema``).
Normal inheritance rules apply to class attributes and methods defined in
a schemanode subclass. If your schemanode subclass inherits from another
schemanode class, your schemanode subclass' methods and class attributes
will override the superclass' methods and class attributes.
Ordering of child schema nodes when inheritance is used works like this:
the "deepest" SchemaNode class in the MRO of the inheritance chain is
consulted first for nodes, then the next deepest, then the next, and so on.
So the deepest class' nodes come first in the relative ordering of schema
nodes, then the next deepest, and so on. For example::
class One(colander.Schema):
a = colander.SchemaNode(
colander.String(),
id='a1',
)
b = colander.SchemaNode(
colander.String(),
id='b1',
)
d = colander.SchemaNode(
colander.String(),
id='d1',
)
class Two(One):
a = colander.SchemaNode(
colander.String(),
id='a2',
)
c = colander.SchemaNode(
colander.String(),
id='c2',
)
e = colander.SchemaNode(
colander.String(),
id='e2',
)
class Three(Two):
b = colander.SchemaNode(
colander.String(),
id='b3',
)
d = colander.SchemaNode(
colander.String(),
id='d3',
)
f = colander.SchemaNode(
colander.String(),
id='f3',
)
three = Three()
The ordering of child nodes computed in the schema node ``three`` will be
``['a2', 'b3', 'd3', 'c2', 'e2', 'f3']``. The ordering starts ``a1``,
``b1``, ``d1`` because that's the ordering of nodes in ``One``, and
``One`` is the deepest SchemaNode in the inheritance hierarchy. Then it
processes the nodes attached to ``Two``, the next deepest, which causes
``a1`` to be replaced by ``a2``, and ``c2`` and ``e2`` to be appended to
the node list. Then finally it processes the nodes attached to ``Three``,
which causes ``b1`` to be replaced by ``b3``, and ``d1`` to be replaced by
``d3``, then finally ``f`` is appended.
Multiple inheritance works the same way::
class One(colander.Schema):
a = colander.SchemaNode(
colander.String(),
id='a1',
)
b = colander.SchemaNode(
colander.String(),
id='b1',
)
d = colander.SchemaNode(
colander.String(),
id='d1',
)
class Two(colander.Schema):
a = colander.SchemaNode(
colander.String(),
id='a2',
)
c = colander.SchemaNode(
colander.String(),
id='c2',
)
e = colander.SchemaNode(
colander.String(),
id='e2',
)
class Three(Two, One):
b = colander.SchemaNode(
colander.String(),
id='b3',
)
d = colander.SchemaNode(
colander.String(),
id='d3',
)
f = colander.SchemaNode(
colander.String(),
id='f3',
)
three = Three()
The resulting node ordering of ``three`` is the same as the single
inheritance example: ``['a2', 'b3', 'd3', 'c2', 'e2', 'f3']`` due to the
MRO deepest-first ordering (``One``, then ``Two``, then ``Three``).
Backwards Incompatibilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Passing non-SchemaNode derivative instances as ``*children`` into a
SchemaNode constructor is no longer supported. Symptom: ``AttributeError:
name`` when constructing a SchemaNode.
0.9.9 (2012-09-24)
------------------
Features
~~~~~~~~
- Allow the use of ``missing=None`` for Number. See
https://github.com/Pylons/colander/pull/59 .
- Create a ``colander.Money`` type that is a Decimal type with
two-decimal-point precision rounded-up.
- Allow ``quant`` and ``rounding`` args to ``colander.Decimal`` constructor.
- ``luhnok`` validator added (credit card luhn mod10 validator).
- Add an ``insert`` method to SchemaNode objects.
- Add an ``insert_before`` method to SchemaNode objects.
- Better class-based mapping schema inheritance model.
* A node declared in a subclass of a mapping schema superclass now
overrides any node with the same name inherited from any superclass.
Previously, it just repeated and didn't override.
* An ``insert_before`` keyword argument may be passed to a SchemaNode
constructor. This is a string naming a node in a superclass. A node
with an ``insert_before`` will be placed before the named node in a
parent mapping schema.
- The ``preparer=`` argument to SchemaNodes may now be a sequence of
preparers.
- Added a ``cstruct_children`` method to SchemaNode.
- A new ``cstruct_children`` API should exist on schema types. If
``SchemaNode.cstruct_children`` is called on a node with a type that does
not have a ``cstruct_children`` method, a deprecation warning is emitted
and ``[]`` is returned (this may or may not be the correct value for your
custom type).
Backwards Incompatibilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~
- The inheritance changes required a minor backwards incompatibility: calling
``__setitem__`` on a SchemaNode will no longer raise ``KeyError`` when
attempting to set a subnode into a node that doesn't already have an
existing subnode by that name. Instead, the subnode will be appended to
the child list.
Documentation
~~~~~~~~~~~~~
- A "Schema Inheritance" section was added to the Basics chapter
documentation.
0.9.8 (2012-04-27)
------------------
- False evaluating values are now serialized to colander.null for
String, Date, and Time. This resolves the issue where a None value
would be rendered as 'None' for String, and missing='None' was not
possible for Date, Datetime, and Time.
See https://github.com/Pylons/colander/pull/1 .
- Updated Brazilian Portugese translations.
- Updated Japanese translations.
- Updated Russian translations.
- Fix documentation: 0.9.3 allowed explicitly passing None to DateTime
to have no default timezone applied.
- Add ``dev`` and ``docs`` setup.py aliases (e.g. ``python setup.py dev``).
0.9.7 (2012-03-20)
------------------
- Using ``schema.flatten(...)`` against a mapping schema node without a name
produced incorrectly dot-prefixed keys. See
https://github.com/Pylons/colander/issues/37
- Fix invalid.asdict for multiple error messages. See
https://github.com/Pylons/colander/pull/22 ,
https://github.com/Pylons/colander/pull/27 ,
https://github.com/Pylons/colander/pull/12 , and
https://github.com/Pylons/colander/issues/2 .
- Invalid.messages() now returns an empty list if there are no messages.
See https://github.com/Pylons/colander/pull/21 .
- ``name`` passed to a SchemaNode constructor was not respected in
declaratively constructed schemas. Now if you pass ``name`` to the
SchemaNode constructor within the body of a schema class, it will take
precedence over the name it's been assigned to in the schema class.
See https://github.com/Pylons/colander/issues/39 .
- Japanese translation thanks to OCHIAI, Gouji.
- Replaced incorrect ``%{err}`` with correct ``${err}`` in String.deserialize
error message. See https://github.com/Pylons/colander/pull/41
0.9.6 (2012-02-14)
------------------
- No longer runs on Python 2.4 or 2.5. Python 2.6+ is now required.
- Python 3.2 compatibility.
- Removed a dependency on the iso8601 package (code from the package is now
inlined in Colander itself).
- Added copyright and licensing information for iso8601-derived code to
LICENSE.txt.
0.9.5 (2012-01-13)
------------------
- Added Czech translation.
- Compile pt_BR translation (it was previously uncompiled).
- Minor docs fixes.
- Documentation added about flatten and unflatten.
0.9.4 (2011-10-14)
------------------
- ``flatten`` now only includes leaf nodes in the flattened dict.
- ``flatten`` does not include a path element for the name of the type node
for sequences.
- ``unflatten`` is implemented.
- Added ``__setitem__`` to ``SchemaNode``, allowing replacement of nodes by
name.
- Added ``get_value`` and ``set_value`` methods to ``Schema`` which allow
access and mutation of appstructs using dotted name paths.
- Add Swedish, French, Chinese translations.
0.9.3 (2011-06-23)
------------------
- Add ``Time`` type.
- Add Dutch translation.
- Fix documentation: 0.9.2 requires ``deserialize`` of types to explicitly
deal with the potential to receive ``colander.null``.
- Use ``default_tzinfo`` when deserializing naive datetimes. See
https://github.com/Pylons/colander/issues#issue/5.
- Allow ``default_tzinfo`` to be ``None`` when creating a
``colander.DateTime``. See
https://github.com/Pylons/colander/issues#issue/6.
- Add the ability to insert a ``colander.interfaces.Preparer`` between
deserialization and validation. See the Preparing section in the
documentation.
0.9.2 (2011-03-28)
------------------
- Added Polish translation, thanks to Jedrzej Nowak.
- Moved to Pylons Project GitHub (https://github.com/Pylons/colander).
- Add tox.ini for testing purposes.
- New API: ``colander.required``. Used as the marker value when a
``missing`` argument is left unspecified.
- Bug fix: if a ``title`` argument which is the empty string or ``None`` is
passed explicitly to a SchemaNode, it is no longer replaced by a title
computed from the name.
- Add SchemaNode.__contains__ to support "name in schema".
- SchemaNode deserialization now unconditionally calls the schema type's
``deserialize`` method to obtain an appstruct before attempting to
validate. Third party schema types should now return ``colander.null`` if
passed a ``colander.null`` value or another logically "empty" value as a
cstruct during ``deserialize``.
0.9.1 (2010-12-02)
------------------
- When ``colander.null`` was unpickled, the reference created during
unpickling was *not* a reference to the singleton but rather a new instance
of the ``colander._null`` class. This was unintentional, because lots of
code checks for ``if x is colander.null``, which will fail across pickling
and unpickling. Now the reference created when ``colander.null`` is
pickled is unpickled as the singleton itself.
0.9 (2010-11-28)
-----------------
- SchemaNode constructor now accepts arbitrary keyword arguments. It
sets any unknown values within the ``**kw`` sequence as attributes
of the node object.
- Added Spanish locale: thanks to Douglas Cerna for the translations!
- If you use a schema with deferred ``validator``, ``missing`` or
``default`` attributes, but you use it to perform serialization and
deserialization without calling its ``bind`` method:
- If ``validator`` is deferred, no validation will be performed.
- If ``missing`` is deferred, the field will be considered *required*.
- If ``default`` is deferred, the serialization default will be
assumed to be ``colander.null``.
- Undocumented internal API for all type objects: ``flatten``.
External type objects should now inherit from
``colander.SchemaType`` to get a default implementation.
0.8 (2010/09/08)
-----------------
- Docstring fixes to ``colander.SchemaNode`` (``missing`` is not the
``null`` value when required, it's a special marker value).
- The concept of "schema binding" was added, which allows for a more
declarative-looking spelling of schemas and schema nodes which have
dependencies on values available after the schema has already been
fully constructed. See the new narrative chapter in the
documentation entitled "Schema Binding".
- The interface of ``colander.SchemaNode`` has grown a ``__delitem__``
method. The ``__iter__``, and ``__getitem__`` methods have now also
been properly documented.
0.7.3 (2010/09/02)
------------------
- The title of a schema node now defaults to a titleization of the
``name``. Underscores in the ``name`` are replaced with empty
strings and the first letter of every resulting word is capitalized.
Previously the ``name`` was not split on underscores, and the
entirety of the ``name`` was capitalized.
- A method of the ``colander.Invalid`` exception named ``messages``
was added. It returns an iterable of error messages using the
``msg`` attribute of its related exception node. If the ``msg``
attribute is iterable, it is returned. If it is not iterable, a
single-element list containing the ``msg`` value is returned.
0.7.2 (2010/08/30)
------------------
- Add an ``colander.SchemaNode.__iter__`` method, which iterates over
the children nodes of a schema node.
- The constructor of a ``colander.SchemaNode`` now accepts a
``widget`` keyword argument, for use by Deform (it is not used
internally).
0.7.1 (2010/06/12)
------------------
- Make it possible to use ``colander.null`` as a ``missing`` argument
to ``colander.SchemaNode`` for roundtripping purposes.
- Make it possible to pickle ``colander.null``.
0.7.0
-----
A release centered around normalizing the treatment of default and
missing values.
Bug Fixes
~~~~~~~~~
- Allow ``colander.Regex`` validator to accept a pattern object
instead of just a string.
- Get rid of circular reference in Invalid exceptions: Invalid
exceptions now no longer have a ``parent`` attribute. Instead, they
have a ``positional`` attribute, which signifies that the parent
node type of the schema node to which they relate inherits from
Positional. This attribute isn't an API; it's used only internally
for reporting.
- Raise a ``TypeError`` when bogus keyword arguments are passed to
``colander.SchemaNode``.
Backwards Incompatiblities / New Features
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- ``missing`` constructor arg to SchemaNode: signifies
*deserialization* default, disambiguated from ``default`` which acted
as both serialization and deserialization default previously.
Changes necessitated / made possible by SchemaNode ``missing``
addition:
- The ``allow_empty`` argument of the ``colander.String`` type was
removed (use ``missing=''`` as a wrapper SchemaNode argument
instead).
- New concept: ``colander.null`` input to serialization and
deserialization. Use of ``colander.null`` normalizes serialization
and deserialization default handling.
Changes necessitated / made possible by ``colander.null`` addition:
- ``partial`` argument and attribute of colander.MappingSchema has
been removed; all serializations are partial, and partial
deserializations are not necessary.
- ``colander.null`` values are added to the cstruct for partial
serializations instead of omitting missing node values from
the cstruct.
- ``colander.null`` may now be present in serialized and
deserialized data structures.
- ``sdefault`` attribute of SchemaNode has been removed; we never need
to serialize a default anymore.
- The value ``colander.null`` will be passed as ``appstruct`` to
each type's ``serialize`` method when a mapping appstruct doesn't
have a corresponding key instead of ``None``, as was the practice
previously.
- The value ``colander.null`` will be passed as ``cstruct`` to
each type's ``deserialize`` method when a mapping cstruct
doesn't have a corresponding key instead of ``None``, as was the
practice previously.
- Types now must handle ``colander.null`` explicitly during
serialization.
- Updated and expanded documentation, particularly with respect to new
``colander.null`` handling.
- The ``value`` argument`` to the ``serialize`` method of a SchemaNode
is now named ``appstruct``. It is no longer a required argument; it
defaults to ``colander.null`` now.
The ``value`` argument to the ``deserialize`` method of a SchemaNode
is now named ``cstruct``. It is no longer a required argument; it
defaults to ``colander.null`` now.
- The ``value`` argument to the ``serialize`` method of each built-in
type is now named ``appstruct``, and is now required: it is no
longer a keyword argument that has a default.
The ``value`` argument to the ``deserialize`` method of each
built-in type is now named ``cstruct``, and is now required: it is
no longer a keyword argument that has a default.
0.6.2 (2010-05-08)
------------------
- The default ``encoding`` parameter value to the ``colander.String``
type is still ``None``, however its meaning has changed. An
encoding of ``None`` now means that no special encoding and decoding
of Unicode values is done by the String type. This differs from the
previous behavior, where ``None`` implied that the encoding was
``utf-8``. Pass the encoding as ``utf-8`` specifically to get the
older behavior back. This is in support of Deform.
- The default ``err_template`` value attached to the ``colander.Date``
and ``colander.Datetime`` types was changed. It is now simply
``Invalid date`` instead of ``_('${val} cannot be parsed as an
iso8601 date: ${err}')``. This is in support of Deform.
- Fix bug in ``colander.Boolean`` that attempted to call ``.lower`` on
a bool value when a default value was found for the schema node.
0.6.1 (2010-05-04)
------------------
- Add a Decimal type (number type which uses ``decimal.Decimal`` as a
deserialization target).
0.6.0 (2010-05-02)
------------------
- (Hopefully) fix intermittent datetime-granularity-related test
failures.
- Internationalized error messages. This required some changes to
error message formatting, which may impact you if you were feeding
colander an error message template.
- New project dependency: ``translationstring`` package for
internationalization.
- New argument to ``colander.String`` constructor: ``allow_empty``.
This is a boolean representing whether an empty string is a valid
value during deserialization, defaulting to ``False``.
- Add minimal documentation about the composition of a
colander.Invalid exception to the narrative docs.
- Add (existing, but previously non-API) colander.Invalid attributes
to its interface within the API documentation.
0.5.2 (2010-04-09)
------------------
- Add Email and Regex validators (courtesy Steve Howe).
- Raise a ``colander.Invalid`` error if a ``colander.SequenceSchema``
is created with more than one member.
- Add ``Function`` validator.
- Fix bug in serialization of non-Unicode values in the ``String`` class.
- Get rid of ``pserialize`` in favor of making ``serialize`` always
partially serialize.
- Get rid of ``pdeserialize``: it existed only for symmetry. We'll
add something like it back later if we need it.
0.5.1 (2010-04-02)
------------------
- The constructor arguments to a the ``colander.Schema`` class are now
sent to the constructed SchemaNode rather than to the type it represents.
- Allow ``colander.Date`` and ``colander.DateTime`` invalid error
messages to be customized.
- Add a ``pos`` argument to the ``colander.Invalid.add`` method.
- Add a ``__setitem__`` method to the ``colander.Invalid`` class.
- The ``colander.Mapping`` constructor keyword argument
``unknown_keys`` has been renamed to ``unknown``.
- Allow ``colander.Mapping`` type to accept a new constructor
argument: ``partial``.
- New interface methods required by types and schema nodes:
``pserialize`` and ``pdeserialize``. These partially serialize or
partially deserialize a value (the definition of "partial" is up to
the type).
0.5 (2010-03-31)
----------------
- 0.4 was mispackaged (CHANGES.txt missing); no code changes from 0.4
however.
0.4 (2010-03-30)
----------------
- Add ``colander.DateTime`` and ``colander.Date`` data types.
- Depend on the ``iso8601`` package for date support.
0.3 (2010-03-29)
----------------
- Subnodes of a schema node are now kept in the ``children`` attribute
rather than the ``nodes`` attribute.
- Add an ``sdefault`` property to ``colander.SchemaNode`` objects.
- Add a ``clone`` method to ``colander.SchemaNode`` objects.
- Add a ``__str__`` method to the ``colander.Invalid`` exception that
prints an error summary.
- Various error message improvements.
- Add ``colander.Length`` validator class.
0.2 (2010-03-23)
----------------
- Make nodetype overrideable.
- Add __getitem__ to SchemaNode.
- Fix OneOf message.
- Capitalize node titles.
- Deal with empty strings in String, Boolean, and Float types.
- Introduce description; make title the same as name.
- Remove copy method from schemanode.
- Allow schema nodes to have titles.
- The term "structure" is too overloaded to use for schema purposes:
structure -> schema node.
- Make Sequence more like Tuple and Mapping (it uses a substructure
rather than a structure parameter to denote its type).
- Add __repr__ and copy methods to structure.
- Add accept_scalar flag to Sequence.
0.1 (2010-03-14)
----------------
- Initial release.
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