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// initialize DocFormat
DocFormat docFormat = new DocFormat(Common.mapSourceFilePath(path));

// get document properties
DocMetadata properties = docFormat.getDocumentProperties();

// update built-in properties
properties.setAuthor("test author");
properties.setCompany("test company");
properties.setManager("test manager");

// commit changes
docFormat.save(Common.mapDestinationFilePath(outputPath));