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NoSQL data stores are commonly schema-less, providing no means for globally defining or managing the schema. While this offers great flexibility in early stages of application development, developers soon can experience the heavy burden of dealing with increasingly heterogeneous data. This paper targets schema evolution for NoSQL data stores, the complex(More)
NoSQL data stores are becoming increasingly popular in application development. These systems are attractive for developers due to their ability to handle large volumes of data, as well as data with ah igh degree of structural variety.T yp-ically,N oSQL data stores are accessed programmatically.D ue to the imminent lack of standardized query languages,(More)
Schema-less NoSQL data stores offer great flexibility in application development , particularly in the early stages of software design. Yeto vert ime, software engineers struggle with the heavy burden of dealing with increasingly heterogeneous data. In this demo we present Cleager,aframework for eagerly managing schema evolution in schema-less NoSQL(More)
Using an object-relational data model and an XML datatype, we show how a relevant subset of XML documents and their implied structure can be mapped onto database structures. Besides straightforward mappings, there are some XML structures that cannot be easily mapped onto database structures. These structures would sometimes result in large database schemas(More)
We present an intelligent information agent that uses semantic methods and natural language processing capabilites in order to gather tourist information from the WWW and present it to the human user in an intuitive, user-friendly way. Thereby, the information agent is designed such that as background knowledge and linguistic coverage increase, its benefits(More)
Although most NoSQL Data Stores are schema-less, information on the structural properties of the persisted data is nevertheless essential during application development. Otherwise, accessing the data becomes simply impractical. In this paper, we introduce an algorithm for schema extraction that is operating outside of the NoSQL data store. Our method is(More)
In der Entwicklung von interaktiven Web-Anwendungen sind NoSQL-Datenbanksysteme zunehmend beliebt, nicht zuletzt, weil sie flexible Datenmodelle erlauben. Das erleichtert insbesondere ein agiles Projektmanagement, das sich durch häufige Releases und entsprechend häufige Änderungen am Datenmodell auszeichnet. In diesem Artikel geben wir einen Überblick über(More)
Most available approaches for XML schema evolution specify the evolution steps for an XML schema or a DTD. This article will show that schema evolution can also be realized on a conceptual model. Schema evolution always requires propagating the changes to the XML documents that are already associated to the schema. This article suggests a method for(More)