Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms.... to_s puts "Creation Date:-" + doc_info . getCreationDate...getKeywords (). to_s puts "Modify Date:-" + doc_info . getModDate ()...