DocBuilder is a professional writing tool for Microsoft Word. User can save often used snippets into library, and get them out when he want to write same kind of words in other files. It's very useful for users who often write similar documents. DocBuilder uses a doc-tree to describe the structure of document. The final document is generated according to the structure of doc-tree, and document titles can be automatically numbered in unified style. DocBuilder also provide template library and style definitions to speed up document writing and formatting.