Hi canally, u dint mention in which u want to retrieve th list item whether to k2.net process or to k2blackpearl process.

But i'm working on K2BP. As per my understanding,i have a solution for u.

1)Drag n drop the Sharepoint Workflow Integration Wizard on to K2Designer for Visual studio.

2)Mention the required fileds like SP SIte and SP List that u want to work with in the wizards of SP Workflow integration.

3) U'll find 'Metadata Mapping and Folio' wizard on which u have 'Assign' tab. Click on Dropdown menu adjacent to Assign tab. U'll find 'All Columns to new process xml fields'. When u click on that u'll need to give process field name and click 'OK'

4) Now u'll find that all columns are automaticaaly assigned and click next to complete the wizard.

5) Now u'll find meta data of SPList in the process field name of ur process in the 'XML Fileds' of 'Process/Activity Data' of 'Object Browser'

6) Now u have the metadata of SPList and u can implement ur logic.