Abstract. We study the formalization process of a collection of documents created for a Software Engineering project from an MKM perspective. We analyze how document and collection markup formats can cope with an open-ended, multi-dimensional space of first and secondary classifications and relations. We show that RDFa-based extensions of MKM formats by flexible “metadata” relations referencing specific vocabularies are well-suited to encode and operationalize this. This explicated knowledge can be used for enriching interactive document browsing, for enabling multi-dimensional metadata queries over documents and collections, and for exporting Linked Data to the Semantic Web and thus enabling further reuse.