Representation of Map Objects with Semi-Structured Data Models
نویسنده
چکیده
Mapping agencies world-wide produce a range of different types of maps, in efforts to meet different user requirements. These maps are usually designed in a digital environment and some of them are distributed through the World Wide Web. One important issue for those agents is the appropriate modelling and handling of map objects from which the digital maps are composed. , This paper focuses on this aspect and as such addresses two aspects. First, the semi-structured nature of data composing a map is discussed. Second, the Object Exchange Model (OEM), a popular model for semi-structured data, is adopted to represent a map. Several configurations regarding the representation of a map in OEM are proposed. Finally, it is shown how useful information can be extracted from those configurations using Lorel query language for semi-structured data.
منابع مشابه
Spatial Clustering of Related Structured Objects for Topographic Map Interpretation
In topographic map interpretation, spatial clustering, i.e., detecting a mosaic of nearly homogeneous sites, is a means for automatically detecting the continuity of morphological environments characterizing a map area. The goal is to group structured objects, i.e. spatial data collected at different sites, such that data inside each cluster models the continuity of morphologic or socio-economi...
متن کاملThe categories of lattice-valued maps, equalities, free objects, and $mathcal C$-reticulation
In this paper, we study the concept of $mathcal C$-reticulation for the category $mathcal C$ whose objects are lattice-valued maps. The relation between the free objects in $mathcal C$ and the $mathcal C$-reticulation of rings and modules is discussed. Also, a method to construct $mathcal C$-reticulation is presented, in the case where $mathcal C$ is equational. Some relations between the conce...
متن کاملORA-SS: An Object-Relationship-Attribute Model for Semi-Structured Data
Semi structured data is becoming increasingly important with the introduction of XML and related languages and technologies The recent shift from DTDs document type de nitions to XML Schema for XML data highlights the importance of a schema de nition for semi structured data applications At the same time there is a move to extend semi structured data models to express richer semantics In this p...
متن کاملXML Schema in XML Documents with Usage Control
With an increasing amount of semi-structured data, XML has become significant to humans and programs. XML promoted by the World Wide Web Consortium (W3C) is rapidly emerging as a new standard language for semi-structured data representation and exchange on the Internet. XML documents usually contain private information that cannot be shared by all user communities. So securing XML data is becom...
متن کاملDTD Level authorization in XML documents with usage control
In recent years an increasing amount of semi-structured data has become important to humans and programs. XML promoted by the World Wide Web Consortium (W3C) is rapidly emerging as the new standard language for semi-structured data representation and exchange on the Internet. XML documents may contain private information that cannot be shared by all user communities. So securing XML data is bec...
متن کامل