grep for XML-based records (Score 3)

There is indeed a version of grep for XML-based records. It's called sgrep (structured grep) and "is a tool for searching and indexing text, SGML, XML and HTML files and filtering text streams using structural criteria." It is based on the concept of regions, i.e. nonempty text substrings that are typically occurrences of constant stsrings, SGML tags, or meaningful text elements recognizable via delimiting strings or the built-in SGML, XML and SGML parser.