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A Formal and Unified Description of XML Manipulation Languages

Hidders J., Paredaens J.

Fundamenta Informaticae

2016

Vol. 145, nr 4

429--470

We discuss three well-known languages for querying and manipulatingXML documents: XQuery, XPath and XSLT. They are considered to be the standard languages for processing XML documents. However, specifying their complete semantics in a formal way seems almost impossible. Indeed, an attempt by the W3C XML Query Working Group to do so for XQuery was ultimately abandoned. We introduce three sublanguages, called MiXPath, MiXQuery and MiXSLT, and describe their syntax and formal semantics. The syntax and semantics of these languages are chosen such that they are consistent with the ones given in the relatedW3C recommendations. As such this provides a practical foundation for research and teaching of XML languages. For this purpose the sublanguages are chosen such that they contain the most crucial features, constructs and expressions of each of these three languages.

PathLog: a Query Language for Schemaless Databases of Partially Labeled Objects

Pankowski T.

Fundamenta Informaticae

2002

Vol. 49, nr 4

369-395

In the paper we deal with the problem of modeling and querying information in schemaless databases of partially labeled objects (PLO-DB). Partially labeled objects are used for modeling data within repositories integrating both structured and semistructured data. The proposed PLO (Partially Labeled Objects) data model originates from the OEM data model and extends it by allowing partial labeling of objects. For PLO-DB we propose a rule-oriented query language PathLog, which data manipulation paradigm is based on set-theoretical operations and on rules (in Datalog style) involving Skolem functions and referential variables. The main contribution of the paper is the development of a formalized and consistent model of schemaless databases of partially labeled objects and its query language PathLog.

Constraint-Based Approach to Semistructured Data

Hacid M-S., Toumani F., Elmagarmid A.K.

Fundamenta Informaticae

2001

Vol. 47, nr 1,2

53-73

In this paper we consider how constraint-based technology can be used to query semistructured data. As many concerns in semistructured data (e.g., representing and retrieving) are also found in computational linguistics, this last area could provide an interesting angle to attack some of the problems regarding semistructured data. We present a formalism based on feature logics1 for querying semistructured data. The formalism is a hybrid one in the sense that it combines clauses with path constraints. The resulting language has a clear declarative and operational semantics based on the notion of extended active domain.