I have hundreds of xml files. These xml files have thousands of a repeadeted schema of documents: <doc></doc> tag as parent tag for documents. Every <doc> has a specific number of tags, like date, abstract, title, authors, etc. I am parsing all these files with saxparser in java, but i am getting an error, when the tag <authors> insides <doc> is missing. I need a small script that runs through all my xml files and whenever there is missing tag for Authors, it should add it, and within this author tag it should add an emty string tag. for example: <authors><str></str></authors>. Please if you have experience in editting xml format and you can do it very confeidently and quick, apply for this job. For professionals it could be an extra quick couple of bucks. but if you are not sure how to do it and wanna try things out, please don't bother contacting me. The programming languages should be one of these: php, java, python. you can shose whatever suits you.