Used to request information stored in CMDB class model. Model 
  information obtained in two ways:
  
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          | __init__(self,
        framework=None) If framework instance is not specified - used one registered for 
      current thread.
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          | isKeyAttribute(self,
        citName,
        attributeName) Check whether specified attribute is a key attribut for specified CIT
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    | com.mercury.topaz.cmdb.shared.classmodel.cmdbclass.attribute.CmdbAttribute |  | 
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          | setAttributeIfExists(self,
        osh,
        attributeName,
        attributeValue,
        attributeTypeStr=AppilogTypes.STRING_DEF) osh, str, object, attribute type -> bool
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