English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

A document type definition (DTD) D defines the structure of elements permitted in any web document valid with respect to D. From a given DTD D we show how to derive a number of simple structural constraints which are implied by D. Using a relational abstraction of web databases, we consider a class of conjunctive queries which retrieve elements from web documents stored in a database D. For simplicity, we assume that all documents in D are valid with respect to the same DTDD. The main contribution of the paper is the use of the constraints derived from D to optimise conjunctive queries on D by removing redundant conjuncts. The relational abstraction allows us to show that the constraints derived from a DTD are equivalent to tuple-generating and equality-generating dependencies which hold on D. Having done so, we can use the chase algorithm to show equivalence between a query and its reduced form.

Optimising Web queries using document type definitions