What are the three different extraction scenarios covered by the parser, and how are they implemented?

The parser handles three scenarios: (1) extracting node attributes (e.g., `ResponseClass` from `m:GetItemResponseMessage`) using `getAttribute` on the element; (2) directly extracting data between tag pairs (e.g., subject or body) via `firstChild.data`; and (3) loop extraction of data between tag pairs for multiple items like recipients or attachments, using `getElementsByTagName` on a parent node and iterating over child nodes. These methods leverage Python's `xml.dom.minidom` module, as detailed in the article's code examples.