晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib64/python2.7/xml/dom/domreg.py
"""Registration facilities for DOM. This module should not be used
directly. Instead, the functions getDOMImplementation and
registerDOMImplementation should be imported from xml.dom."""

from xml.dom.minicompat import *  # isinstance, StringTypes

# This is a list of well-known implementations.  Well-known names
# should be published by posting to xml-sig@python.org, and are
# subsequently recorded in this file.

import sys

well_known_implementations = {
    'minidom':'xml.dom.minidom',
    '4DOM': 'xml.dom.DOMImplementation',
    }

# DOM implementations not officially registered should register
# themselves with their

registered = {}

def registerDOMImplementation(name, factory):
    """registerDOMImplementation(name, factory)

    Register the factory function with the name. The factory function
    should return an object which implements the DOMImplementation
    interface. The factory function can either return the same object,
    or a new one (e.g. if that implementation supports some
    customization)."""

    registered[name] = factory

def _good_enough(dom, features):
    "_good_enough(dom, features) -> Return 1 if the dom offers the features"
    for f,v in features:
        if not dom.hasFeature(f,v):
            return 0
    return 1

def getDOMImplementation(name = None, features = ()):
    """getDOMImplementation(name = None, features = ()) -> DOM implementation.

    Return a suitable DOM implementation. The name is either
    well-known, the module name of a DOM implementation, or None. If
    it is not None, imports the corresponding module and returns
    DOMImplementation object if the import succeeds.

    If name is not given, consider the available implementations to
    find one with the required feature set. If no implementation can
    be found, raise an ImportError. The features list must be a sequence
    of (feature, version) pairs which are passed to hasFeature."""

    import os
    creator = None
    mod = well_known_implementations.get(name)
    if mod:
        mod = __import__(mod, {}, {}, ['getDOMImplementation'])
        return mod.getDOMImplementation()
    elif name:
        return registered[name]()
    elif not sys.flags.ignore_environment and "PYTHON_DOM" in os.environ:
        return getDOMImplementation(name = os.environ["PYTHON_DOM"])

    # User did not specify a name, try implementations in arbitrary
    # order, returning the one that has the required features
    if isinstance(features, StringTypes):
        features = _parse_feature_string(features)
    for creator in registered.values():
        dom = creator()
        if _good_enough(dom, features):
            return dom

    for creator in well_known_implementations.keys():
        try:
            dom = getDOMImplementation(name = creator)
        except StandardError: # typically ImportError, or AttributeError
            continue
        if _good_enough(dom, features):
            return dom

    raise ImportError,"no suitable DOM implementation found"

def _parse_feature_string(s):
    features = []
    parts = s.split()
    i = 0
    length = len(parts)
    while i < length:
        feature = parts[i]
        if feature[0] in "0123456789":
            raise ValueError, "bad feature name: %r" % (feature,)
        i = i + 1
        version = None
        if i < length:
            v = parts[i]
            if v[0] in "0123456789":
                i = i + 1
                version = v
        features.append((feature, version))
    return tuple(features)

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