ABSTRACT:The workgroup for Digital Reconstruction of the Digital Humanities in the German-speaking area association (Digital Humanities im deutschsprachigen Raum e.V.) was founded in 2014 as cross-disciplinary scientific society dealing with all aspects of digital reconstruction of cultural heritage and currently involves more than 40 German researchers. Moreover, the workgroup is dedicated to synchronise and foster methodological research for these topics. As one preliminary result a memorandum was created to name urgent research challenges and prospects in a condensed way and assemble a research agenda which could propose demands for further research and development activities within the next years. The version presented within this paper was originally created as a contribution to the so-called agenda development process initiated by the German Federal Ministry of Education and Research (BMBF) in 2014 and has been amended during a joint meeting of the digital reconstruction workgroup in November 2014.

<p><strong>Abstract.</strong> Digital Cultural Heritage and Digital Humanities are, historically seen, in focus of different communities as well as approaching different research topics and - from an organizational point of view - departments. However, are they that different? The idea of this joint article involving digital humanists and heritage researchers is to examine communities, concepts and research applications as well as shared challenges. Beyond a collection of problem-centred essays this is intended to initiate a fruitful discussion about commonalities and differences between both scholarly fields as well as to assess to which extent they are two sides of the same medal.</p>

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Since the 1990s, the application of digital 3D reconstruction and computer-based visualization of cultural heritage has increased. Virtual reconstruction and 3D visualization have revealed a new "glittering" research space for object-oriented disciplines such as archaeology, art history and architecture. Nevertheless, the scientists concerned with the new technology soon recognized the lack of documentation standards in the 3D projects, leading to the loss of information, findings and the fusion of knowledge behind the digital 3D representation. Based on the methodological fundamentals of digital 3D reconstruction, the potentials and challenges in the light of emerging Semantic Web and Web3D technologies is introduced here. The presentation describes a scientific methodology and a collaborative web-based research environment followed by crucial features for these kinds of projects. As the groundwork, a human-and machine-readable "language of objects" and the implementation of these semantic patterns for spatial research purposes on destroyed and/or never realized tangible cultural heritage will be discussed. Using examples from the practice, the presentation explains the requirements of the Semantic Web (Linked Data), the role of controlled vocabularies, the architecture of the VRE and the impact of a customized integration of interactive 3D models within WebGL technology. The presentation intends to showcase the state-of-the-art steps on the way to a digital research infrastructure. The focus lies on the introduction of scholarly approved and sustainable digital 3D reconstruction, compliant with recognized documentation standards and following the Linked Data requirements. Key words:Digital hypothetical 3D reconstruction, 3D modeling, data modeling, Linked Data, Virtual Research Environment THE THREE-DIMENSIONAL MODEL AND DIGITAL 3D RECONSTRUCTIONThe three-dimensional model has been used as a simplified representation of reality for a long time in architecture, the fine arts, art and architectural history and archaeology. The model can serve different purposes: to represent an existing original or to communicate a creative vision. Especially

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