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A mouse model for congenital nephrotic syndrome (NPHS1) was generated by inactivating the nephrin gene (Nphs1) in embryonic stem cells by homologous recombination. The targeting construct contained the Escherichia coli lacZ gene as a reporter for the Nphs1 promoter. Mice homozygous for inactivated Nphs1 were born at an expected frequency of 25%. Although(More)
Structured texts (for example dictionaries and user manuals) typically have a heirarchical (tree-like) structure. We describe a query language for retrieving information from collections of hierarchical text. The language is based on a tree pattern matching notion called tree inclusion. Tree inclusion allows easy expression of queries that use the structure(More)
Regular expressions with numerical occurrence indicators (#REs) are used in established text manipulation tools like Perl and Unix egrep, and in the recent W3C XML Schema Definition Language. Numerical occurrence indicators do not increase the expressive power of regular expressions, but they do increase the succinctness of expressions by an exponential(More)
Combined text and relational database support is increasingly recognized as an emerging need of industry, spanning applications requiring text elds as parts of their data (e.g., for customer support) to those augmenting primary text resources by conventional relational data (e.g., for publication control). In this paper, we propose extensions to SQL that(More)
Regular expressions with numeric occurrence indicators are an extension of traditional regular expressions, which let the required minimum and the allowed maximum number of iterations of subexpressions be described with numeric parameters. We consider the problem of testing whether a given regular expression E with numeric occurrence indicators is(More)
Sgrep is a Unix tool for searching the contents of text files. Sgrep implements an algebra of unrestricted text fragments called regions. The algebra allows the retrieval of document components, represented as regions, based on conditions on their relative containment and ordering. This simple yet powerful model is suitable for querying structured document(More)
XML Schema uses an extension of traditional regular expressions for describing allowed contents of document elements. Iteration is described through numeric attributes <b>minOccurs</b> and <b>maxOccurs</b> attached to content-describing elements such as <b>sequence</b>, <b>choice</b>, and <b>element</b>. These numeric(More)