Obtain a complete xml tag

This is an example XML file

 Gambardella, Matthew XML Developer's Guide Computer 44.95      2000-10-01 An in-depth look at creating applications with XML. Ralls, Kim Midnight Rain Fantasy 5.95      2000-12-16 A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world. Corets, Eva Maeve Ascendant Fantasy 5.95      2000-11-17 After the collapse of a nanotechnology society in England, the young survivors lay the foundation for a new society. Corets, Eva Oberon's Legacy Fantasy 5.95      2001-03-10 In post-apocalypse England, the mysterious agent known only as Oberon helps to create a new life for the inhabitants of London. Sequel to Maeve Ascendant. Corets, Eva The Sundered Grail Fantasy 5.95      2001-09-10 The two daughters of Maeve, half-sisters, battle one another for control of England. Sequel to      Oberon's Legacy. Randall, Cynthia Lover Birds Romance 4.95      2000-09-02 When Carla meets Paul at an ornithology conference, tempers fly as feathers get ruffled. Thurman, Paula Splish Splash Romance 4.95      2000-11-02 A deep sea diver finds true love twenty thousand leagues beneath the sea. Knorr, Stefan Creepy Crawlies Horror 4.95      2000-12-06</publish_date> An anthology of horror stories about roaches, centipedes, scorpions and other insects. Kress, Peter Paradox Lost Science Fiction 6.95      2000-11-02</publish_date> After an inadvertant trip through a Heisenberg Uncertainty Device, James Salway discovers the problems of being quantum. O'Brien, Tim Microsoft .NET: The Programming Bible Computer 36.95      2000-12-09</publish_date> Microsoft's .NET initiative is explored in      detail in this deep programmer's reference. O'Brien, Tim MSXML3: A Comprehensive Guide Computer 36.95      2000-12-01</publish_date> The Microsoft MSXML3 parser is covered in      detail, with attention to XML DOM interfaces, XSLT processing, SAX and more. Galos, Mike Visual Studio 7: A Comprehensive Guide Computer 49.95      2001-04-16</publish_date> Microsoft Visual Studio 7 is explored in depth, looking at how Visual Basic, Visual C++, C#, and ASP+ are integrated into a comprehensive development environment.

(Obtained from Microsoft MSDN. See the original article here)

Imagine that you want the full tag for ONE specific book, the one with the id bk106, and nothing else.

Use the following line sed -n '/\<book.*id.*=.*"bk106"\>/,/<\/book\>/p' books.xml