This book constitutes the refereed conference proceedings of the 25th International Conference on Language Processing and Knowledge in the Web, GSCL 2013, held in Darmstadt, Germany, in September 2013.

Reconstructing Complete Lemmas for Incomplete German Compounds.- Error Annotation of the Arabic Learner Corpus: A New Error Tagset.- SdeWaC – A Corpus of Parsable Sentences from the Web.- Probabilistic Explicit Topic Modeling Using Wikipedia.- Decision Tree-Based Evaluation of Genitive Classification.- Extending the TuBa-D/Z Treebank with GermaNet Sense Annotation.- Topic Modeling for Word Sense Induction.- Phrase Tagset Mapping for French and English Treebanks and Its Application in Machine Translation Evaluation.- Part-Of-Speech Tagging for Social Media Texts.- Summarizing Answers for Community Question Answer Services.- Fine-Grained POS Tagging of German Tweets.- Pattern-Based Distinction of Paradigmatic Relations for German Nouns, Verbs, Adjectives.- Dependency-Based Algorithms for Answer Validation Task in Russian Question Answering.

This book constitutes the refereed conference proceedings of the First International Conference on Language Processing and Knowledge in the Web, GSCL 2013, held in Darmstadt, Germany, in September 2013. The 20 revised full papers were carefully selected from numerous submissions and cover topics on language processing and knowledge in the Web on several important dimensions, such as computational linguistics, language technology, and processing of unstructured textual content in the Web.