UniOffice is a commercial Go library for reading, writing, and converting Office Open XML (OOXML) documents, including Word (.docx), Excel (.xlsx), and PowerPoint (.pptx) formats. It provides a high-level API for document manipulation, supporting features such as text formatting, tables, images, charts, animations, ActiveX controls, digital ink, and 3D models. The library also includes conversion to PDF via the UniPDF dependency. Architecturally, the library is layered: low-level schema types auto-generated from OOXML schemas handle XML marshalling/unmarshalling and validation; a middle layer of wrapper structs (e.g., Document, Spreadsheet, Presentation) provides a user-friendly interface; and conversion utilities transform documents to PDF. Key entry points include the main module (unioffice.go) for namespace handling and document type detection, common/common.go for core types like DocBase and ContentTypes, and the document/spreadsheet/presentation modules for specific operations. Data flows involve reading a ZIP package, parsing XML into schema types, manipulating via the high-level API, and writing back. The library relies on external dependencies such as unipdf (PDF generation), unichart (chart rendering), unitype (font parsing), and others for encryption and image processing. It requires a license key and uses obfuscated generated code to protect intellectual property. Despite the obfuscation, the library contains several well-designed, reusable components such as a storage abstraction, logger interface, wildcard matching, natural sort, measurement conversions, color parsing, MS-CFB binary format reader/writer, and an Excel number format engine. These components are self-contained and could be extracted for use in other projects.