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.... Metadata .containsKey(String) com.aspose.pdf.Metadata.tryGetValue(String...tryGetValue(String,Object[]) com.aspose.pdf.Metadata.tryGetValue(String,XmpValue[])...