Querying web metadata: Native score management and text support in databases

Gültekin Özsoyoǧlu*, Ismail Sengör Altingövde, Abdullah Al-Hamdani, Selma Ayşe Özel, Özgür Ulusoy, Zehra Meral Özsoyoǧlu

*المؤلف المقابل لهذا العمل

نتاج البحث: المساهمة في مجلةArticleمراجعة النظراء

10 اقتباسات (Scopus)


In this article, we discuss the issues involved in adding a native score management system to object-relational databases, to be used in querying Web metadata (that describes the semantic content of Web resources). The Web metadata model is based on topics (representing entities), relationships among topics (called metalinks), and importance scores (sideway values) of topics and metalinks. We extend database relations with scoring functions and importance scores. We add to SQL score-management clauses with well-defined semantics, and propose the sidewayvalue algebra (SVA), to evaluate the extended SQL queries. SQL extensions and the SVA algebra are illustrated through two Web resources, namely, the DBLP Bibliography and the SIGMOD Anthology. SQL extensions include clauses for propagating input tuple importance scores to output tuples during query processing, clauses that specify query stopping conditions, threshold predicates (a type of approximate similarity predicates for text comparisons), and user-defined-function-based predicates. The propagated importance scores are then used to rank and return a small number of output tuples. The query stopping conditions are propagated to SVA operators during query processing. We show that our SQL extensions are well-defined, meaning that, given a database and a query Q, under any query processing scheme, the output tuples of Q and their importance scores stay the same. To process the SQL extensions, we discuss two sideway value algebra operators, namely, sideway value algebra join and topic closure, give their implementation algorithms, and report their experimental evaluations.

اللغة الأصليةEnglish
الصفحات (من إلى)581-634
عدد الصفحات54
دوريةACM Transactions on Database Systems
مستوى الصوت29
رقم الإصدار4
المعرِّفات الرقمية للأشياء
حالة النشرPublished - ديسمبر 2004
منشور خارجيًانعم

ASJC Scopus subject areas

  • ???subjectarea.asjc.1700.1710???


أدرس بدقة موضوعات البحث “Querying web metadata: Native score management and text support in databases'. فهما يشكلان معًا بصمة فريدة.

قم بذكر هذا