Dynamic Packaging
Dynamic packaging is travel industry jargon for a cheaper and more flexible way of booking a holiday. In terms of the customer /consumer, the premise is that dynamic packaging mimics the experience of visiting a travel agent and negotiating a deal the consumer wants.
In terms of the supplier, it allows them to package their own holidays and make better margins, whilst still offering a competitive price compared to their direct competitors. That said, you'll rarely see the phrase on a web site. Sites have adopted rather more straightforward descriptions of the technology: Book Together and Save, Build Your Own or Flight + Hotel, etc.

XML
XML or to give it its full name eXtensible Mark-up Language is a specification developed by the W3C. XML is a pared-down version of Standard Generalised Mark-Up Language, designed especially for Web documents. It allows designers to create their own customised tags, enabling the definition, transmission, validation, and interpretation of data between applications and between organisations.

XML Suppliers (XML Feeds)
If your site is going to succeed on the web, it needs to contain useful, free content targeted directly at a a particular market such as travel. Take a look at any of the most popular travel sites on the internet : Expedia, Last Minute, Cheapest Flights, Sky Bargains, etc. All of these sites provide dynamic content based on XML Supplier Feeds, these feed simply provide the content in XML format (see above). This is then used to support various sections of the site (e.g. flights, accommodation, car hire or insurance).

Web Services
A Web service is a software system identified by a URI, whose public interfaces and bindings are defined and described using XML. Its definition can be discovered by other software systems. These systems may then interact with the Web service in a manner prescribed by its definition, using XML based messages conveyed by Internet protocols.