# Smart Factory Web--A Blueprint Architecture for Open Marketplaces for Industrial Production
## 5 Smart Factory Web Approach
### Factory Registration and Interoperability
\begin{table}
\begin{tabular}{c c} \hline \hline
**Ontology Relation** & **Definition** \\ \hline isSubAssetOf (_isSuperAssetOf_) & An asset, e.g., a production line, consists of several robots that work together. These can be related to the production line via the relation isSubAssetOf. \\ \hline hasSupplier (_isSupplierTo_) & Enables the linking of assets, i.e., the description of supplier relationships between two factories. \\ \hline offersProduct (_offeredBy_) & Allows an asset (e.g., manufacturer, supplier) to be associated with a product that is being manufactured or supplied. \\ \hline isSubProductOf (_hasSubProduct_) & The subproducts of a product can be described with the relation isSubProductOf. The relation hasSubProduct allows conclusions to be drawn about the respective subproducts of a product. The subproducts in turn allow conclusions to be drawn about the producing companies that manufacture these subproducts (relation offeredBy). \\ \hline hasInputProduct (_isProcessedBy_) & In a production process, input products (materials, subproducts, components, etc.) are further processed into output products. The relation hasInputProduct enables the link to the input products. \\ \hline hasOutputProduct (_isCreatedBy_) & The relation hasOutputProduct enables the link to the created output products. \\ \hline hasProductProperty (_specifiesProduct_) & Relation between a product and a property to describe the characteristics of a product in more detail. \\ \hline hasCapability & Relation between an asset and an ability to specify the capabilities of an asset. \\ \hline hasProperty & Relating a capability to a property to describe the characteristics of a capability in more detail. \\ \hline hasUnitOfMeasure & Relation between a property and a unit of measurement to specify the properties definitively with the associated unit of measurement. \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Description of the ontology relations. \begin{table}
\begin{tabular}{c c} \hline \hline
**Ontology Concept** & **Definition** \\ \hline Asset & Asset is a factory or part of the factory equipment hierarchy as defined in [17]. In the context of SFW, an asset can be a supplier for another factory. Examples of an asset in SFW: factory, supplier, manufacturer, distributor, retailer, production line, production machine, manufacturing resource, sensor, etc. \\ \hline Capability & Capability (of an asset) is described in terms of its input and output products and their respective properties, and/or in terms of how the product can be produced. The capability concept enables the modeling of process steps (BOP Bill of Process, e.g., manufacturing processes for the production of a product). \\ \hline Product & Input (materials, part products) or output (result) of a production process. The product structure (BOM Bill of Material—structured arrangement of objects, e.g., components) in the SFW platform can be described using the concept product and the corresponding inverse relation. \\ \hline Property & The property concept is used to describe capabilities and products in more detail. There are no particular restrictions on properties. These may cover a broad spectrum such as production rates, physical dimensions, materials, carbon footprint, fair trade compliance, etc. \\ \hline Unit of Measure & The Unit of Measure concept specifies units of measurement for properties (e.g., kilogram, liter, piece, etc.). \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Description of the ontology concepts. To speed up registration and facilitate maintenance of registered information, interoperability could be further improved by using the Industrie 4.0 Asset Administration Shell (AAS) for registration. The AAS concept and meta-model is about to be standardized on the IEC level. Furthermore, there are multiple activities to agree upon AAS sub-models in industrial communities (dedicated to certain asset types and processes) with semantic definitions defined by ECLASS and other international vocabularies such as IEC Common Data Dictionary.