JET uses XPath expressions instead of the DPTK node language. JET tags use a select attribute to indicate an XPath expression that returns a collection of objects or a value, and a test attribute for an XPath expression expected to return a Boolean result. DPTK typically uses node or nodes attributes for this purpose. JET consistently uses the attribute var in tags that define a variable. DPTK typically uses name, but sometimes uses it in other contexts, too, and it sometimes uses useName for variable definition.
The DPTK .pattern file provides pattern metadata. In JET, metadata is stored in the META-INF/MANIFEST.MF file and the plugin.xml file. Opening either of these files will open the standard Eclipse Plug-in Manifest Editor. This editor lets you edit far more information than is contained in the .pattern file. Information equivalent to that in the .pattern file is found on the Overview and Extensions tabs.
The Overview tab lets you define the unique ID of the JET transformation, as well as the version number and descriptive name. The fields circled in the screen capture below determine these values. The Provider field allows you to insert your organization name in the transformation.

<start resource="%foo(name)%.txt" .../>
<ws:file path="{$foo/@name}.txt .../>