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Being an important data exchange and information storage standard, XML has generated a great deal of interest and particular attention has been paid to the issue of XML indexing. Clear use cases for structured search in XML have been established. However, most of the research in the area is either based on relational database systems or specialized semi‐structured data management systems. This paper aims to propose a method for XML indexing based on the information retrieval (IR) system Okapi.

First, the paper reviews the structure of inverted files and gives an overview of the issues of why this indexing mechanism cannot properly support XML retrieval, using the underlying data structures of Okapi as an example. Then the paper explores a revised method implemented on Okapi using path indexing structures. The paper evaluates these index structures through the metrics of indexing run time, path search run time and space costs using the INEX and Reuters RVC1 collections.

Initial results on the INEX collections show that there is a substantial overhead in space costs for the method, but this increase does not affect run time adversely. Indexing results on differing sized Reuters RVC1 sub‐collections show that the increase in space costs with increasing the size of a collection is significant, but in terms of run time the increase is linear. Path search results show sub‐millisecond run times, demonstrating minimal overhead for XML search.

Overall, the results show the method implemented to support XML search in a traditional IR system such as Okapi is viable.

The paper provides useful information on a method for XML indexing based on the IR system Okapi.

Tabletop interfaces are a novel class of technologies that are particularly suited to support co‐located collaboration. The Collaborative Puzzle Game (CPG) is a tabletop interactive activity developed for fostering collaboration skills in children with Autism Spectrum Disorders (ASD). The CPG features an interaction rule called Enforced Collaboration (EC); in order to be moved, puzzle pieces must be touched and dragged simultaneously by the two players. Two studies were conducted to test the effect of EC on collaboration. In Study I, 70 typically developing boys were tested in pairs to characterise the way they respond to EC; in Study II, 16 boys with ASD were tested in pairs. Results suggest that EC has a generally positive effect on collaboration and is associated with more complex interactions. For children with ASD, the EC interaction rule was effective in triggering behaviours associated with co‐ordination of the task and negotiation.

The paper provides a new definition of healthy and functional food considering the case of sorghum, which is dealing with environmental challenges, calling for exploration of eco-conscious consumers' behavior in the free-from food innovative market.

Through a systematic literature review and bibliometric analysis, this article offers a deep and broad outlook on a sustainable open innovations approach for agri-food systems. The bibliometric analysis includes a total of 198 scientific papers, deeply analyzed through Bibliometrix package.

Results show increasing academic interest in sustainable innovations for the agri-food system, where the relevance of the food-grade sorghum is noticed. An open innovation approach is called for to deal with environmental challenges.

Theoretically, the research offers a new definition of healthy and functional food in line with current environmental challenges. It also provides a deep literature review on eco-conscious consumers and food-grade sorghum as functional food in the context of the free-from food market.