@register.tag
def sitetree_url(parser, token):
    return sitetree_urlNode.for_tag(parser, token, 'for', 'sitetree_url for someitem')
This tag is much the same as Django built-in 'url' tag.
dataset/ETHPy150Open idlesign/django-sitetree/sitetree/templatetags/sitetree.py/sitetree_url