For exporting a library, Twine 2 produces an archive format.
A library is defined as a collection of one or more stories with each following the Twine 2 HTML Output Specification.
Example:
<tw-storydata name="Example 1" startnode="1" creator="Twine" creator-version="2.7.1" format="Harlowe" format-version="3.3.7" ifid="606B5476-BA53-4A70-B4F5-F6794AE67744" options="" tags="" zoom="1" hidden><style role="stylesheet" id="twine-user-stylesheet" type="text/twine-css"></style><script role="script" id="twine-user-script" type="text/twine-javascript"></script><tw-passagedata pid="1" name="Untitled Passage" tags="" position="900,400" size="100,100"></tw-passagedata></tw-storydata>
<tw-storydata name="Example 2" startnode="1" creator="Twine" creator-version="2.7.1" format="Harlowe" format-version="3.3.7" ifid="1188096A-464B-4A12-9B08-822D4BB60D0E" options="" tags="" zoom="1" hidden><style role="stylesheet" id="twine-user-stylesheet" type="text/twine-css"></style><script role="script" id="twine-user-script" type="text/twine-javascript"></script><tw-passagedata pid="1" name="Untitled Passage" tags="" position="900,400" size="100,100"></tw-passagedata></tw-storydata>