Structured Documents for Representing Services in Internet Marketplaces

Internet Marketplaces are a new computational paradigm with a huge economic potential. These markets extend the concept of electronic commerce by putting an emphasis on simple access and combination of data and computational services. Among the different market services offered, service repositories are vital for the success of the Internet Marketplace. Service repositories not only act as interfaces between marketplace users (i.e., customers and providers) and the marketplace infrastructure, but also between the different heterogeneous services. On the one hand, they should allow service providers to register their complex services with minimal effort. On the other hand, customers should be able to locate and combine services easily without having to struggle with technical details. Additionally, because of highly dynamic service collections service repositories should be open and extensible In this paper, we present our MMM service market architecture in which service registration, s..

Distributed Method Management with CORBA

The Internet hosts a rapidly number of services for remote computing. The second generation of services are distributed method management systems (DMMS) that support consumers and providers to participate in electronic markets for methods (programs, scripts, etc.). We suggest to build standardized DMMS based on CORBA, instead of heterogeneous, domain specific solutions. An architecture is proposed and a simple solution to wrap script-like methods into CORBA Application Objects is presented

Query Optimization for Structured Documents Based on Knowledge on the Document Type Definition

Declarative access mechanisms for structured document collections and for semi-structured data are becoming increasingly important. In this article, using a rule-based approach for query optimization and applying it to such queries, we deploy knowledge on the Document Type Definition (DTD) to formulate transformation rules for query-algebra terms. Specifically, we look at rules that save navigation along paths by cutting off these paths or by replacing them with access operations to indices, i.e., materialized views on paths. We show for both cases that we correctly apply and completely exploit knowledge on the DTD, and we briefly discuss performance results. 1 Introduction With the growing number of documents available via WWW and their increasingly larger size, WWW query languages are gaining importance. Many researchers currently investigate such languages, e.g., [2, 14]. The kind of documents they examine are structured documents, i.e., XML [18] and SGML [12] documents as well as..

Dataset accompanying Batáry et al. 2017 Nature Ecology & Evolution

<p>Dataset containing species richness and abundance of plants, carabids, spiders and rove beetles, and environmental background<br> data. For details please see the original publication:<br> Batáry, P., Gallé, R., Riesch, R., Fischer, C., Dormann, C.F., Mußhoff, O., Császár, P., Fusaro, S., Gayer, C., Happe, A.-K.,<br> Kurucz, K., Molnár, D., Rösch, V., Wietzke, A., Tscharntke, T. (2017). The former iron curtain still drives biodiversity-profit<br> trade-offs in German agriculture. Nature Ecology & Evolution. DOI: 10.1038/s41559-017-0272-x</p