remove mapstructure from identity,networking,objectstorage,orchestration,pagination
diff --git a/openstack/networking/v2/networks/results.go b/openstack/networking/v2/networks/results.go
index 7251273..7f64ddb 100644
--- a/openstack/networking/v2/networks/results.go
+++ b/openstack/networking/v2/networks/results.go
@@ -1,7 +1,6 @@
 package networks
 
 import (
-	"github.com/mitchellh/mapstructure"
 	"github.com/gophercloud/gophercloud"
 	"github.com/gophercloud/gophercloud/pagination"
 )
@@ -12,17 +11,11 @@
 
 // Extract is a function that accepts a result and extracts a network resource.
 func (r commonResult) Extract() (*Network, error) {
-	if r.Err != nil {
-		return nil, r.Err
-	}
-
-	var res struct {
+	var s struct {
 		Network *Network `json:"network"`
 	}
-
-	err := mapstructure.Decode(r.Body, &res)
-
-	return res.Network, err
+	err := r.ExtractInto(&s)
+	return s.Network, err
 }
 
 // CreateResult represents the result of a create operation.
@@ -48,26 +41,26 @@
 // Network represents, well, a network.
 type Network struct {
 	// UUID for the network
-	ID string `mapstructure:"id" json:"id"`
+	ID string `json:"id"`
 
 	// Human-readable name for the network. Might not be unique.
-	Name string `mapstructure:"name" json:"name"`
+	Name string `json:"name"`
 
 	// The administrative state of network. If false (down), the network does not forward packets.
-	AdminStateUp bool `mapstructure:"admin_state_up" json:"admin_state_up"`
+	AdminStateUp bool `json:"admin_state_up"`
 
 	// Indicates whether network is currently operational. Possible values include
 	// `ACTIVE', `DOWN', `BUILD', or `ERROR'. Plug-ins might define additional values.
-	Status string `mapstructure:"status" json:"status"`
+	Status string `json:"status"`
 
 	// Subnets associated with this network.
-	Subnets []string `mapstructure:"subnets" json:"subnets"`
+	Subnets []string `json:"subnets"`
 
 	// Owner of network. Only admin users can specify a tenant_id other than its own.
-	TenantID string `mapstructure:"tenant_id" json:"tenant_id"`
+	TenantID string `json:"tenant_id"`
 
 	// Specifies whether the network resource can be accessed by any tenant or not.
-	Shared bool `mapstructure:"shared" json:"shared"`
+	Shared bool `json:"shared"`
 }
 
 // NetworkPage is the page returned by a pager when traversing over a
@@ -79,38 +72,31 @@
 // NextPageURL is invoked when a paginated collection of networks has reached
 // the end of a page and the pager seeks to traverse over a new one. In order
 // to do this, it needs to construct the next page's URL.
-func (p NetworkPage) NextPageURL() (string, error) {
-	type resp struct {
-		Links []gophercloud.Link `mapstructure:"networks_links"`
+func (page NetworkPage) NextPageURL() (string, error) {
+	var s struct {
+		Links []gophercloud.Link `json:"networks_links"`
 	}
-
-	var r resp
-	err := mapstructure.Decode(p.Body, &r)
+	err := page.ExtractInto(&s)
 	if err != nil {
 		return "", err
 	}
-
-	return gophercloud.ExtractNextURL(r.Links)
+	return gophercloud.ExtractNextURL(s.Links)
 }
 
 // IsEmpty checks whether a NetworkPage struct is empty.
-func (p NetworkPage) IsEmpty() (bool, error) {
-	is, err := ExtractNetworks(p)
-	if err != nil {
-		return true, nil
-	}
-	return len(is) == 0, nil
+func (page NetworkPage) IsEmpty() (bool, error) {
+	is, err := ExtractNetworks(page)
+	return len(is) == 0, err
 }
 
 // ExtractNetworks accepts a Page struct, specifically a NetworkPage struct,
 // and extracts the elements into a slice of Network structs. In other words,
 // a generic collection is mapped into a relevant slice.
 func ExtractNetworks(page pagination.Page) ([]Network, error) {
-	var resp struct {
-		Networks []Network `mapstructure:"networks" json:"networks"`
+	r := page.(NetworkPage)
+	var s struct {
+		Networks []Network `json:"networks"`
 	}
-
-	err := mapstructure.Decode(page.(NetworkPage).Body, &resp)
-
-	return resp.Networks, err
+	err := r.ExtractInto(&s)
+	return s.Networks, err
 }