Converts LaTeX math into MathML.

Arrolio is a paged-media layout engine: it takes a content tree plus a layout spec (page templates, styles, flows) and produces a sequence of laid-out pages, which a renderer then emits — by default to PDF bytes via the sibling `pdfrb` gem. Arrolio is the middle layer of a three-library stack: * `pdfrb` — pure-Ruby PDF library (bytes <-> model). * `arrolio` — FOP-like paged layout (this gem; depends on pdfrb). * `loom` — multi-target layout compiler (separate gem; emits to Arrolio, CSS, XSL-FO, IDML). Arrolio itself owns: page templates, threaded flows, Knuth-Plass line and page breaking, tables, lists, SVG, page-model selection, running headers/footers, and the rendering pipeline. It does not own the PDF byte format (Pdfrb does) or any DSL (Loom does).

AsciiChem is an ASCII syntax for representing chemical formulae, reactions, electron configurations, bonds, crystals, spectra, calculations, Z-matrices, and reaction mechanisms. It parses to a semantic model and renders to MathML, HTML, LaTeX, SVG, and CML. Math embedding uses Plurimath. Round-trips to native CML via chemicalml.

A Ruby library for parsing, validating, converting, signing, and building PTB Digital Calibration Certificates (DCC) and D-SI quantity documents. Uses lutaml-model for a fully typed object representation of both XML schemas, with per-major-version (v2, v3) class hierarchies.

A Ruby library for representing and processing Metanorma document XML, providing a comprehensive model for standards documents with support for various metadata, content blocks, and structured markup.

Library to work with NISO STS and ISOSTS.

Library to work with UnitsML in Ruby