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PMA.core supports two main types of annotations PMA.core annotations and 3rd party annotations but also some native annotations for the 3dHistech MRXS and Hamamatsu NDPI formats.
PMA.core annotations uses it's own internal format based on WKT(Well-known text) and it supports the following shapes Polygon, Linestring, Point and Multipoint. You can also change the color, fill color and line thickness for these annotations. PMA.core also supports the some associated information for every annotation like the classification and free text notes.
3rd party annotations supported are from the vendors Visiopharm, Indica Labs and Aperio. Each of this format is supported via parsing the respective vendor specific file, for Visiopharm that is .mld, for Indica Labs is .annotations and for Aperio is .xml