Encontrados 7 documentos, a visualizar página 1 de 1
XCSL : XML constraint specification language
Jacinto, Marta Henriques; Librelotto, Giovani Rubert; Ramalho, José Carlos; Henriques, Pedro RangelAfter being able to mark-up text and validate its structure according to a document type specification, we may start thinking it would be natural to be able to validate some nonstructural issues in the documents. This paper is to formally discuss semantic-related aspects. In that context, we introduce a domain specific language developed for such a purpose: XCSL. XCSL is not just a language, it is also a proces...
XML templates for constraints (XTC) : um nível de abstracção para linguagens de...
Jacinto, Marta Henriques; Ramalho, José Carlos; Henriques, Pedro RangelOs DTDs permitem etiquetar um texto e validar a sua estrutura contra uma gramática. As linguagens de especificação de restrições (XML Constraint Specification Languages), nomeadamente o XCSL, o Schematron e os XML-Schemas, num nível mais elevado, já permitem validar aspectos não estruturais dos documentos XML, tais como: relações entre elementos, ou atributos, pertencentes a diferentes contextos; invariantes so...
Bidirectional conversion between XML documents and relational data bases
Jacinto, Marta Henriques; Librelotto, Giovani Rubert; Ramalho, José Carlos; Henriques, Pedro RangelRelational databases have been used as support to the information storage since a long time ago. Maintenance and the natural growing of information systems imply the reuse of existing databases but, many times, information is not stored on the most convenient structure or in the desired platform; then it becomes necessary to export it into another system or to transform its structure. These tasks should be exec...
XCSL tutorial
Jacinto, Marta Henriques; Librelotto, Giovani Rubert; Ramalho, José Carlos; Henriques, Pedro RangelXML brought the concept of well-formmedness to the world of structured documents. An XML document can be well-formed or valid. To be valid it just has to convey certain rules specified in a DTD or XML Schema. DTDs enable us to specify structure rules and a little bit of dynamic semantics. Additionally, XML Schemas enable us to specify some static semantics. However, there are applications where we need to speci...
XCSL : XML constraint specification language
Jacinto, Marta Henriques; Librelotto, Giovani Rubert; Ramalho, José Carlos; Henriques, Pedro RangelAfter being able to mark-up text and validate its structure according to a document's type specification, we may start thinking it would be natural to be able to validate some non-structural issues in the documents. This paper is to formally discuss semantic-related aspects. In that context, we introduce a domain specific language developed for such a purpose: XCSL. XCSL is not just a language, it is also a pro...
Constraint specification languages : comparing XCSL, Schematron and XML-Schemas
Jacinto, Marta Henriques; Librelotto, Giovani Rubert; Ramalho, José Carlos; Henriques, Pedro RangelAfter being able to mark-up text and validate its structure according to a grammar, we may start thinking it would be natural to be able to validate some non-structural issues in XML documents like relationships between elements belonging to different contexts, invariants over data models, constraints over attribute values and relationships between attributes. XML Schemas are a big step in that direction. Howe...
XML and semantic validation
Jacinto, Marta Henriques; Henriques, Pedro Rangel; Ramalho, José CarlosWith XML as with SGML, we can have structural correctness, once they provide syntactic rules to state how to mark-up all the documents of the same family (of the same type); moreover, XML also imposes a working approach in which there is a complete separation between the structure of the data and the way it looks. So it is possible to avoid that someone will write a letter putting the ending before the body. Al...
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