Development of CaSSius illustrates how to create unified documents for HTML and PDF in publishing.
Over the past week I've done some of the initial development work on [CaSSius](https://github.com/MartinPaulEve/CaSSius), the portion of the typesetter for the [Open Library of Humanities](https://www.openlibhums.org) that produces PDF output. The idea here is that, as a publisher, you want to produce one document and then create HTML and PDF from that single source. CaSSius provides two ways to achieve this.
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Martin Paul Eve (2015) studied this question.
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