منابع مشابه
Translating Relational Schema with Constraints into Xml Schema
With XML adopted as technology trend on the Internet, and with investment in the current relational database systems, companies must convert their relational data into XML documents for data transmission on the Internet. In the process, to preserve the users’ relational data requirements of data constraints into the converted XML documents, we must define a meaningful root element for each XML ...
متن کامل1 XML schema mappings using schema constraints and Skolem functions ?
A schema mapping is an executable specification describing transformation of data structured under different schemas. In this paper we discuss the problem of automatic generation of XML schema mappings using information provided by schemas and correspondences between schemas. Mappings are specified in a mapping language XDMap whose constructs are based on Skolem functions. We use Skolem functio...
متن کاملWhat's Hard about XML Schema Constraints?
Data description for XML usually comes in the form of a type specification (e.g., a DTD) together with integrity constraints. XML Schema allows one to mix DTD features with semantic information, such as keys and foreign keys. It was shown recently [2,7] that the interaction of DTDs with constraints may be rather nontrivial. In particular, testing if a general specification is consistent is unde...
متن کاملObject-Oriented Constraints for XML Schema
This paper presents an object-oriented representation of the core structural and constraint-related features of XML Schema. The structural features are represented within the limitations of object-oriented type systems including particles (elements and groups) and type hierarchies (simple and complex types and type derivations). The applicability of the developed representation is demonstrated ...
متن کاملConstraints preserving schema mapping from XML to relations
As XML becomes a standard for data representation on the internet, there is a growing interest in storing XML using relational database technology. To date, none of these techniques have considered the semantics of XML as expressed by keys and foreign keys. In this paper, we present a storage mapping which preserves not only the content and structure of XML data, but also its semantics.
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ژورنال
عنوان ژورنال: IEEE Transactions on Knowledge and Data Engineering
سال: 2012
ISSN: 1041-4347
DOI: 10.1109/tkde.2011.74