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Description
Classical THB-spline refinement in isogeometric analysis relies on nested tensor-product spaces, which limits its efficiency for strongly directional solution features. This work presents an anisotropic refinement framework based on decoupled patchwork B-splines (DPB-splines), enabling patch-wise and directionally selective refinement while preserving standard element-wise assembly. The construction couples patch-local basis functions with a recursive selection-and-truncation strategy and integrates Bézier extraction to flatten the hierarchy into standard element-level structures for straightforward assembly in existing finite element codes. The implementation is developed within the open-source GeoPDEs framework in Octave/MATLAB and is currently assessed on basic model problems designed to highlight directional refinement effects. These examples are intended to demonstrate feasibility, clarify the construction, and provide a foundation for more advanced anisotropic adaptive strategies in future applications.