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This module supports selecting XML/HTML tags based on CSS selectors.
See the `CSSSelector` class for details.

This is a thin wrapper around cssselect 0.7 or later.
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    Usage::

        >>> from lxml import etree, cssselect
        >>> select = cssselect.CSSSelector("a tag > child")

        >>> root = etree.XML("<a><b><c/><tag><child>TEXT</child></tag></b></a>")
        >>> [ el.tag for el in select(root) ]
        ['child']

    To use CSS namespaces, you need to pass a prefix-to-namespace
    mapping as ``namespaces`` keyword argument::

        >>> rdfns = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'
        >>> select_ns = cssselect.CSSSelector('root > rdf|Description',
        ...                                   namespaces={'rdf': rdfns})

        >>> rdf = etree.XML((
        ...     '<root xmlns:rdf="%s">'
        ...       '<rdf:Description>blah</rdf:Description>'
        ...     '</root>') % rdfns)
        >>> [(el.tag, el.text) for el in select_ns(rdf)]
        [('{http://www.w3.org/1999/02/22-rdf-syntax-ns#}Description', 'blah')]

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