Sample OME-XML and OME-TIFF files can be found here: Image downloads resource.
Each schema version’s samples are located in a folder named after the schema’s date e.g. folder OME-TIFF/2016-06/ has samples using schema version OME/2016-06.
See the OME-TIFF sample data section for more information about the sample TIFF files. The OME-XML files contained in the OME-XML folder are named to reflect the aspects of the Data Model they demonstrate so they should be self-explanatory.