Language Science Press has published Head-Driven Phrase Structure Grammar: The handbook.

In 32 chapters, the handbook covers the major aspects and developments of HPSG. The following chapters are (co-)authored by IEAS members:

Chapter 3: Formal background (Frank Richter)
Chapter 17: Idioms (Manfred Sailer)
Chapter 22: Semantics (Jean-Pierre Koenig & Frank Richter)

There were over 1,800 downloads of (parts of) the handbook in November – with Frank’s chapter on the formal background being the most frequently downloaded individual chapter!

References

Müller, Stefan, Abeillé, Anne, Borsley, Robert D. & Koenig, Jean-Pierre (eds.). 2021. Head-Driven Phrase Structure Grammar: The handbook. (Empirically Oriented Theoretical Morphology and Syntax 9). Berlin: Language Science Press. DOI: 10.5281/zenodo.5543318. URL: https://langsci-press.org/catalog/book/259