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.. _configure_directive:
``configure``
-------------
Because :term:`ZCML` is XML, and because XML requires a single root
tag for each document, every ZCML file used by :mod:`pyramid` must
contain a ``configure`` container directive, which acts as the root
XML tag. It is a "container" directive because its only job is to
contain other directives.
Attributes
~~~~~~~~~~
``xmlns``
The default XML namespace used for subdirectives.
Example
~~~~~~~
.. code-block:: xml
:linenos:
<configure xmlns="http://pylonshq.com/pyramid">
<!-- other directives -->
</configure>
.. _word_on_xml_namespaces:
A Word On XML Namespaces
~~~~~~~~~~~~~~~~~~~~~~~~
Usually, the start tag of the ``<configure>`` container tag has a
default *XML namespace* associated with it. This is usually
``http://pylonshq.com/pyramid``, named by the ``xmlns`` attribute of
the ``configure`` start tag.
Using the ``http://pylonshq.com/pyramid`` namespace as the default XML
namespace isn't strictly necessary; you can use a different default
namespace as the default. However, if you do, the declaration tags
which are defined by :mod:`pyramid` such as the ``view`` declaration
tag will need to be defined in such a way that the XML parser that
:mod:`pyramid` uses knows which namespace the :mod:`pyramid` tags are
associated with. For example, the following files are all completely
equivalent:
.. topic:: Use of A Non-Default XML Namespace
.. code-block:: xml
:linenos:
<configure xmlns="http://namespaces.zope.org/zope"
xmlns:pyramid="http://pylonshq.com/pyramid">
<include package="pyramid.includes" />
<pyramid:view
view="helloworld.hello_world"
/>
</configure>
.. topic:: Use of A Per-Tag XML Namespace Without A Default XML Namespace
.. code-block:: xml
:linenos:
<configure>
<include package="pyramid.includes" />
<view xmlns="http://pylonshq.com/pyramid"
view="helloworld.hello_world"
/>
</configure>
For more information about XML namespaces, see `this older, but simple
XML.com article <http://www.xml.com/pub/a/1999/01/namespaces.html>`_.
The conventions in this document assume that the default XML namespace
is ``http://pylonshq.com/pyramid``.
Alternatives
~~~~~~~~~~~~
None.
See Also
~~~~~~~~
See also :ref:`helloworld_declarative`.
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