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      <h1>The RcppCWB Package: Towards Text as Linguistic Data</h1>
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<div id="the-rcppcwb-package-towards-text-as-linguistic-data" class="section level1">

<p>The Open Corpus Workbench (CWB) is an early development of an indexing and querying engine. Its core functionality is to efficiently store large structurally and linguistically annotated corpora and to offer the query language of the Corpus Query Processor (CQP) to run simple to complex queries that make use of the annotations of the corpus. The CWB has inspired a set of developments such as Manatee, SketchEngine, and Finlib. But the CWB is still used as a backend for popular tools such as TXM or CQPweb. It is an old tool, yet it is actively maintained and developed, and offers a mature and efficient pure C implementation. LICENSE</p>
<p>The RcppCWB is the second approach to create a wrapper library to make the functionality of the CWB accessible from R. Indeed, the package rcqp, issued first at CRAN in 2015, still offers an extremely sound access to CWB functionality from R. However, the pure C implementation of the rcqp package comes with high barriers to add further functionality to the package, and restricts possibilities to make it portable for Windows machines. The primary purpose of the RcppCWB package is to reimplement a wrapper library for the CWB using a design that makes it easy to maintain the package and to make it portable to Windows. The C libraries of the CWB are compiled as a first step as static libraries, here it is Rcpp wrappers that expose the functionality. In addition, RcppCWB includes a set of higher level functions implemented using Rcpp for standard performance criticial tasks.</p>
<p>Even though RcppCWB may be used in an analytical workflow directly, the best use of it may be to use it as an interface for packages with higher-level functionality that offer a portable R environment to work efficiently with large, linguistically and structurally annotated corpora.</p>
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