The growing relevance of Big Data and the Internet of Things (IoT) leads to a need for an efficient handling of this data. One key concept to achieve efficient data handling is their semantic description. In the environmental and energy domain, these issues become more relevant since there are measurement stations that produce large amounts of data that software systems have to deal with. In the context of cloud-based infrastructure and virtualisation via containers, microservice architectures and scalability become important aspects in software engineering. This article presents the design of a web service providing software systems with semantic descriptions of data fostering a microservice architecture. It implements key concepts such as domain modelling, schema versioning and schema modularisation. It is evaluated and demonstrated in the context of a current environmental use case.