Ontology Based Query Expansion - Retrieval Support for the Domain of Educational Research

Document type: Journal: Volume: Number: Pages: Additional material: Language: 2 documents’ titles. This is illustrated by the excerpt from a result list which is presented in Figure 41. Figure 41: Excerpt from a result list In the result list, the document titles were interlinked with the respective metadata pages of the documents. Amongst others, these pages presented the following information about the documents: their title, subtitle, author name(s) and an abstract. Figure 42 exemplarily shows the metadata (2) of a result document. Figure 42: Example of document metadata After having gained an overview of the document’s metadata, the users could decide whether or not they considered the document as relevant for the current retrieval topic. If this was the case, the document could be marked as relevant by following the link Select document as relevant (1). The document was accordingly added to the user’s collection of relevant documents for the current topic, unless the respective id was already included in the list of collected documents, in which case the user was informed about this circumstance. The list of collected documents could be consulted at any time during the search process and it was also possible to delete selected documents from this list. 8.8.2. Automatic System The implementation of the automatic system’s query expansion component was based on the results of the automatic query expansion experiments described in chapter 7. These results provided a basis for deciding which semantic relations should be used in the automatic expansion mode. These decisions are summarized in the following section, followed by an explanation of how the expansion terms were employed to create automatically expanded queries.