import ( "github.com/hashicorp/terraform/helper/schema" "github.com/hashicorp/terraform/helper/schema/structure" ) func mySchema() *schema.Resource { return &schema.Resource{ Schema: map[string]*schema.Schema{ "property1": &schema.Schema{ Type: schema.TypeString, Optional: true, Description: "The value of property1", }, "property2": &schema.Schema{ Type: schema.TypeString, Optional: true, Description: "The value of property2", }, }, Read: func(d *schema.ResourceData, m interface{}) error { // use ResourceDataPartial to get a subset of the data partial := schema.PartialMapFromSchema(schema.KeysSubset(d.State(), []string{"property1"})) // use struct.Decode to decode the partial data var data struct{ Property1 string } if err := structure.Decode(partial, &data); err != nil { return err } // set the value of property1 on the resource data d.Set("property1", data.Property1) return nil }, } }In this example, we define a Terraform resource schema with two properties, 'property1' and 'property2'. We then define a 'Read' function for the resource, which uses the `ResourceDataPartial` to retrieve a subset of the resource data. We then use the `structure.Decode` function to decode the partial data into a Go struct, and set the value of `property1` on the resource data. Overall, the `ResourceDataPartial` type is a powerful tool for retrieving and manipulating subsets of resource data in a Terraform provider. This can help you write more efficient, targeted provider code.