Github user tliron commented on a diff in the pull request:

    https://github.com/apache/incubator-ariatosca/pull/95#discussion_r111194890
  
    --- Diff: extensions/aria_extension_tosca/simple_v1_0/modeling/__init__.py 
---
    @@ -677,21 +715,18 @@ def pattern(node_type, container): # pylint: 
disable=unused-argument
         return None
     
     
    -def parse_implementation_string(context, service_template, implementation):
    -    if not implementation:
    -        return None, ''
    +def split_prefix(string):
    +    split = IMPLEMENTATION_PREFIX_REGEX.split(string, 2)
    +    if len(split) < 2:
    +        return None, string
    +    return split[0].strip(), split[1].lstrip()
     
    -    index = implementation.find('>')
    -    if index == -1:
    -        return None, implementation
    -    plugin_name = implementation[:index].strip()
    -    
    -    if plugin_name == 'execution':
    -        plugin_specification = None
    -    else:
    -        plugin_specification = 
service_template.plugin_specifications.get(plugin_name)
    -        if plugin_specification is None:
    -            raise ValueError('unknown plugin: "{0}"'.format(plugin_name))
     
    -    implementation = implementation[index+1:].strip()
    -    return plugin_specification, implementation
    +def set_nested(the_dict, keys, value):
    --- End diff --
    
    :+1:


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