The expandedStemming element is a child of the parserOptions element. It has no child elements.
As described in the Search Concepts and Processes chapter, ATG Search performs morphological analysis on content to derive the terms to index and query by. For most forms, a single index term is derived; however, for some forms, multiple index terms are possible. For example, the form spoke is both a noun root and a past tense form of the verb root speak.
During indexing, if multiple index terms are possible, ATG Search chooses the most common term (as defined in the dictionary). At query time, ATG Search uses all root terms for each query term. Part-of-speech tagging can help determine if the terms should be limited, such as choosing the noun spoke for a phrase like thespoke, but is not always able to correctly interpret queries. This tag determines what sort of stem expansion is used:
<expandedStemming>val</expandedStemming>If val is false, expansion is performed only on a single index term. If val is all, all index terms are used during expansion. And a value of untagged means that query terms that could not be part-of-speech tagged use all index terms for expansion.
