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In employer information requirements (EIR), the client formulates project-relevant modeling requirements for the contractor, which are usually only checked ex post.
The contents of EIR documents include general information about the project, technical requirements for geometric and semantic detail, transfer formats and versions, as well as requirements for the structure of the models to be created. Currently, there is usually an intermediate step in which the required information has to be filtered out and then manually entered into the BIM authoring software. The background to this is the creation and distribution of these documents in paper-based form. In addition, many employers usually do not (yet) have in-depth BIM know-how or access to specific BIM software applications that could overcome this issue.
Achieving model conformance with these documents in the ex post process risks inefficiency and error-proneness due to the iterative and manual nature of the process. The A Priori approach proposes a framework for creating a machine-readable EIR-compliant modeling template prior to the actual modeling process in terms of a machine-readable EIR.