Import keywords existing in the predefined hierarchical keywords

[chpicone]

When we import a raster using the REST GeoNode Api, currently GeoNode is adding some custom keywords like the name of the layer, "geotif" ect. The customer wants to use (from the provided set of keywords in the metadata) just the keywords already defined via the Hierarchical Keywords admin page.

Example 1: In GeoNode the following keywords are defined: A; B; C If we load an image with the keywords C; D; E (from the XMP metadatadefinition) just the keyword C must be saved.

Example 2: In GeoNode the following keywords are defined: A; B; C If we load an image with the keywords D; E (from the XMP metadatadefinition). Cause GeoNode needs at least 1 keyword we will use the type of the layer (eg GeoTif)

[mattiagiupponi]

Keywords now will be handled in two different points:

• Parsing: -- the keywords will be extracted from the XML and ONLY the keywords that are already defined in GeoNode. Only those will be preserved and will continue the process
• Storing: -- Since the KeywordHandler in GeoNode goes in append/extend, the keywords automatically assigned (like filename, GeoTIFF ecc..) are going to be deleted in the METADATA_STORERS hook. The hook will loop all the keywords assigned to the layer and will keep ONLY the keywords that are considered valid from the parsing process.

Example: Parsing:	XML	In GeoNode	Output	Notes
k1, k2, k3	k1, k2, k5	k1 , k2	k3is discarded

Storing:	From parsing	Layer	Output	Notes
k1, k2	k1, k2, k6 , k7	k1 , k2	k6 and k7 are going to be deleted

Ouput: The Layer uploaded will have k1 and k2 as keywords