## 4 Implementation of an Open Data Platform in Accordance with the Proposed Approach
### Introducing Hazelnut Trait Ontology  
The main purpose of developing hazelnut trait ontology is to develop a shared a common vocabulary and to provide an international format to standardize a general understanding with respect to hazelnuts. hazelnut trait ontology was developed using Web Ontology Language (OWL) considering the top-down approach in consultation with the hazelnut specialists. According to the top-down approach, the initial work for building an ontology is to begin the process by modeling top-level concepts [58]. hazelnut trait ontology consists of five top-level concepts named descriptors such as passport, management, environment and site, characterization and evaluation descriptors [59]. These descriptors are the top-level classes of the ontology and also, they designate the class hierarchy with the sub descriptors. The definitions and number of sub descriptors of each main descriptor are demonstrated on Table 3. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Descriptor** & **Definition** & **Number of Sub Descriptor** \\ \hline \multirow{3}{*}{Passport} & -Provides basic information used for the & Two main descriptors \\  & general information of the accession & -First descriptor has 14 sub descriptors \\  & -Describes parameters when the accession is & -Second descriptor has 23 sub descriptors. \\  & originally collected & \\ \hline \multirow{3}{*}{Management} & -Provides the basis for the management & \multirow{3}{*}{One main descriptor and this has 12} \\  & -Assists their multiplication & sub-descriptors. \\  & and regeneration & \\ \hline \multirow{3}{*}{Environment and Site} & -Describes the environmental and & Two main descriptors \\  & site-specific parameters & -First descriptor has 15 sub- descriptors \\ \cline{1-1}  & -Second descriptor has 1 main descriptor & \\ \cline{1-1}  & and this has 22 sub-descriptors. \\ \hline \multirow{3}{*}{Characterization} & -Enables an easy and quick discrimination & One main descriptor and this has 10 \\ \cline{1-1}  & between phenotypes & sub-descriptors \\ \hline \multirow{3}{*}{Evaluation} & -Indudes characters such as yield, & \multirow{3}{*}{Seven main descriptors and these descriptors} \\ \cline{1-1}  & agronomic performance, stress & \\ \cline{1-1}  & susceptibilities and biochemical and & \\ \cline{1-1}  & cytological traits & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Definitions, Number of Sub Descriptors and Use of the Descriptors. The descriptors demonstrated on Table 3 are in a hierarchical structure that means subclass-superclass relationships within the ontology, so while creating hazelnut trait ontology, this hierarchy should be considered. Table 3 presents an overview of the major descriptors of hazelnut. The hazelnut trait ontology is a hierarchical classification based on a \"is_a\" hierarchy. The detailed information concerning hazelnut trait ontology was provided at the link below: [[https://github.com/hazelnut-trait-ontology/hto](https://github.com/hazelnut-trait-ontology/hto)]([https://github.com/hazelnut-trait-ontology/hto](https://github.com/hazelnut-trait-ontology/hto)). Materials and Tools Used for the Development and Implementation of WSN and Open Data Platform Based on Proposed Approach  
The initial component of the open-data platform is the establishment of a typical wireless sensor network to meet the requirements of gathering environmental data using sensors. Hence, a WSN, which consists of one coordinator and seven sensors plugged on three routers was built. The first sensor plugged on router 1 is BME280. It can measure relative humidity from 0 to 100% with \(\pm\)3% accuracy, barometric pressure from 300 Pa to 1100 hPa with \(\pm\) 1 hPa absolute accuracy and temperature from \(-\)40 \({}^{\circ}\)C to 85 \({}^{\circ}\)C with \(\pm\)1.0 \({}^{\circ}\)C accuracy. The second sensor plugged on router 1 is GUVA-S12 SD UV. It detects the UV wavelength from 240 nm to 370 nm in sunlight. The third and the last one plugged on router 1 is MICS-4514.