bl_info = {    "name": "XMP Metadata Sidecar with Hierarchical Keywords",    "blender": (4, 2, 0),    "category": "File",}import bpyimport os# Function to create the XMP file with hierarchical keywordsdef create_xmp_file(filepath, keywords, description, credit):    xmp_filename = filepath.replace(".blend", ".xmp")    # Prepare hierarchical keywords (split by '|')    keyword_list = keywords.split('|')    hierarchical_keywords = ''.join([f"<rdf:li>{kw}</rdf:li>" for kw in keyword_list])    xmp_content = f"""<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?><x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='Blender XMP Tool'>    <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>        <rdf:Description rdf:about=''            xmlns:dc='http://purl.org/dc/elements/1.1/'            xmlns:photoshop='http://ns.adobe.com/photoshop/1.0/'>            <dc:subject>                <rdf:Bag>                    {hierarchical_keywords}                </rdf:Bag>            </dc:subject>            <dc:description>{description}</dc:description>            <photoshop:Credit>{credit}</photoshop:Credit>        </rdf:Description>    </rdf:RDF></x:xmpmeta><?xpacket end='w'?>"""    # Write the XMP file    with open(xmp_filename, 'w') as f:        f.write(xmp_content)# Operator to handle the XMP metadata saving processclass SaveXMPMetadataOperator(bpy.types.Operator):    bl_idname = "wm.save_xmp_metadata"    bl_label = "Save XMP Metadata"        def execute(self, context):        scene = context.scene        keywords = scene.xmp_metadata_keywords        description = scene.xmp_metadata_description        credit = scene.xmp_metadata_credit        filepath = bpy.data.filepath                if filepath:            create_xmp_file(filepath, keywords, description, credit)            self.report({'INFO'}, f"XMP Metadata saved to: {filepath.replace('.blend', '.xmp')}")        else:            self.report({'WARNING'}, "Please save the Blender file first.")                return {'FINISHED'}# Panel for the graphical interfaceclass XMPMetadataPanel(bpy.types.Panel):    bl_label = "XMP Metadata"    bl_idname = "VIEW3D_PT_xmp_metadata"    bl_space_type = 'VIEW_3D'    bl_region_type = 'UI'    bl_category = 'XMP Metadata'    def draw(self, context):        layout = self.layout        scene = context.scene        layout.prop(scene, "xmp_metadata_keywords")        layout.prop(scene, "xmp_metadata_description")        layout.prop(scene, "xmp_metadata_credit")        layout.operator("wm.save_xmp_metadata")# Function to automatically save XMP when the Blender file is saveddef auto_save_xmp(scene):    filepath = bpy.data.filepath    if filepath:        keywords = scene.xmp_metadata_keywords        description = scene.xmp_metadata_description        credit = scene.xmp_metadata_credit        create_xmp_file(filepath, keywords, description, credit)# Property definitions for metadata fieldsdef register_properties():    bpy.types.Scene.xmp_metadata_keywords = bpy.props.StringProperty(        name="Hierarchical Keywords",        description="Enter hierarchical keywords separated by '|'. Example: 'Keyword1|SubKeyword1|SubKeyword2'"    )    bpy.types.Scene.xmp_metadata_description = bpy.props.StringProperty(        name="Description",        description="Enter a description for the XMP metadata"    )    bpy.types.Scene.xmp_metadata_credit = bpy.props.StringProperty(        name="Credit",        description="Enter a credit for the XMP metadata"    )def unregister_properties():    del bpy.types.Scene.xmp_metadata_keywords    del bpy.types.Scene.xmp_metadata_description    del bpy.types.Scene.xmp_metadata_credit# Add-on registrationdef register():    bpy.utils.register_class(SaveXMPMetadataOperator)    bpy.utils.register_class(XMPMetadataPanel)    register_properties()    bpy.app.handlers.save_post.append(auto_save_xmp)def unregister():    bpy.utils.unregister_class(SaveXMPMetadataOperator)    bpy.utils.unregister_class(XMPMetadataPanel)    unregister_properties()    bpy.app.handlers.save_post.remove(auto_save_xmp)if __name__ == "__main__":    register()