Unable to extract values from .yang file available inside "identity" for xml file generation.

[thearpittripathi]

I am trying to generate xml output using pyang -f xsd --xsd-groups --xsd-no-any-augments filename.yang

Input Yang file:
module toaster {

yang-version 1;

namespace
"http://netconfcentral.org/ns/toaster";

prefix toast;

organization "Netconf Central";

contact
"Andy Bierman andy@netconfcentral.org";

description
"YANG version of the TOASTER-MIB.

Copyright (c) 2009 Andy Bierman and the persons identified as
authors of the code. All rights reserved.

Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the BSD 3-Clause License
http://opensource.org/licenses/BSD-3-Clause";

revision "2009-11-20" {
description
"Toaster module in progress.";
}

identity toast-type {
description
"Base for all bread types supported by the toaster.
New bread types not listed here nay be added in the
future.";
}

identity white-bread {
base toast:toast-type;
description "White bread.";
}

identity wheat-bread {
base toast-type;
description "Wheat bread.";
}

identity wonder-bread {
base toast-type;
description "Wonder bread.";
}

identity frozen-waffle {
base toast-type;
description "Frozen waffle.";
}

identity frozen-bagel {
base toast-type;
description "Frozen bagel.";
}

identity hash-brown {
base toast-type;
description "Hash browned potatos.";
}

typedef DisplayString {
type string {
length "0 .. 255";
}
description
"YANG version of the SMIv2 DisplayString TEXTUAL-CONVENTION.";
reference
"RFC 2579, section 2.";

}

container toaster {
presence
"Indicates the toaster service is available";
description
"Top-level container for all toaster database objects.";
leaf toasterManufacturer {
type DisplayString;
config false;
mandatory true;
description
"The name of the toaster's manufacturer. For instance,
Microsoft Toaster.";
}

leaf toasterModelNumber {
  type DisplayString;
  config false;
  mandatory true;
  description
    "The name of the toaster's model. For instance,
         Radiant Automatic.";
}

leaf toasterStatus {
  type enumeration {
    enum "up" {
      value 1;
      description
        "The toaster knob position is up.
                No toast is being made now.";
    }
    enum "down" {
      value 2;
      description
        "The toaster knob position is down.
                Toast is being made now.";
    }
  }
  config false;
  mandatory true;
  description
    "This variable indicates the current state of 
         the toaster.";
}

} // container toaster

rpc make-toast {
description
"Make some toast.
The toastDone notification will be sent when
the toast is finished.
An 'in-use' error will be returned if toast
is already being made.
A 'resource-denied' error will be returned
if the toaster service is disabled.";
input {
leaf toasterDoneness {
type uint32 {
range "1 .. 10";
}
default '5';
description
"This variable controls how well-done is the
ensuing toast. It should be on a scale of 1 to 10.
Toast made at 10 generally is considered unfit
for human consumption; toast made at 1 is warmed
lightly.";
}

  leaf toasterToastType {
    type identityref {
      base toast:toast-type;
    }
    default 'wheat-bread';
    description
      "This variable informs the toaster of the type of 
             material that is being toasted. The toaster 
             uses this information, combined with 
             toasterDoneness, to compute for how 
             long the material must be toasted to achieve 
             the required doneness.";
  }
}

} // rpc make-toast

rpc cancel-toast {
description
"Stop making toast, if any is being made.
A 'resource-denied' error will be returned
if the toaster service is disabled.";
} // rpc cancel-toast

notification toastDone {
description
"Indicates that the toast in progress has completed.";
leaf toastStatus {
type enumeration {
enum "done" {
value 0;
description "The toast is done.";
}
enum "cancelled" {
value 1;
description
"The toast was cancelled.";
}
enum "error" {
value 2;
description
"The toaster service was disabled or
the toaster is broken.";
}
}
description
"Indicates the final toast status";
}
} // notification toastDone
} // module toaster

[thearpittripathi]

XML file is generating but does not have all values.

Output XML:

---

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:yin="urn:ietf:params:xml:schema:yang:yin:1"
xmlns:nc="urn:ietf:params:xml:ns:netconf:base:1.0"
xmlns:ncn="urn:ietf:params:xml:ns:netconf:notification:1.0"
targetNamespace="http://netconfcentral.org/ns/toaster"
xmlns="http://netconfcentral.org/ns/toaster"
elementFormDefault="qualified"
attributeFormDefault="unqualified"
version="2009-11-20"
xml:lang="en"
xmlns:toast="http://netconfcentral.org/ns/toaster">

<xs:import
namespace="urn:ietf:params:xml:ns:netconf:base:1.0"
schemaLocation="http://www.iana.org/assignments/xml-registry/schema/netconf.xsd"/> <xs:import
namespace="urn:ietf:params:xml:ns:netconf:notification:1.0"
schemaLocation="http://www.iana.org/assignments/xml-registry/schema/notification.xsd"/>
xs:annotation
xs:documentation
This schema was generated from the YANG module toaster
by pyang version 1.2.

  The schema describes an instance document consisting
  of the entire configuration data store, operational
  data, rpc operations, and notifications.
  This schema can thus NOT be used as-is to
  validate NETCONF PDUs.
</xs:documentation>

</xs:annotation>

xs:annotation
xs:documentation
YANG version of the TOASTER-MIB.

  Copyright (c) 2009 Andy Bierman and the persons identified as
  authors of the code.  All rights reserved.

  Redistribution and use in source and binary forms, with or
  without modification, is permitted pursuant to, and subject
  to the license terms contained in, the BSD 3-Clause License
  http://opensource.org/licenses/BSD-3-Clause
</xs:documentation>

</xs:annotation>

<xs:simpleType name="DisplayString">
xs:annotation
xs:documentation
YANG version of the SMIv2 DisplayString TEXTUAL-CONVENTION.
</xs:documentation>
</xs:annotation>

<xs:restriction base="xs:string">
  <xs:minLength value="0"/>
  <xs:maxLength value="255"/>
</xs:restriction>

</xs:simpleType>

<xs:element name="toaster">
xs:annotation
xs:documentation
Top-level container for all toaster database objects.
</xs:documentation>
</xs:annotation>
xs:complexType
xs:sequence
<xs:element name="toasterManufacturer" type="DisplayString">
xs:annotation
xs:documentation
The name of the toaster's manufacturer. For instance,
Microsoft Toaster.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="toasterModelNumber" type="DisplayString">
xs:annotation
xs:documentation
The name of the toaster's model. For instance,
Radiant Automatic.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="toasterStatus">
xs:annotation
xs:documentation
This variable indicates the current state of
the toaster.
</xs:documentation>
</xs:annotation>
xs:simpleType
<xs:restriction base="xs:string">
<xs:enumeration value="up"/>
<xs:enumeration value="down"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="make-toast" substitutionGroup="nc:rpcOperation">
xs:annotation
xs:documentation
Make some toast.
The toastDone notification will be sent when
the toast is finished.
An 'in-use' error will be returned if toast
is already being made.
A 'resource-denied' error will be returned
if the toaster service is disabled.
</xs:documentation>
</xs:annotation>
xs:complexType
xs:complexContent
<xs:extension base="nc:rpcOperationType">
xs:sequence
<xs:element name="toasterDoneness" minOccurs="0">
xs:annotation
xs:documentation
This variable controls how well-done is the
ensuing toast. It should be on a scale of 1 to 10.
Toast made at 10 generally is considered unfit
for human consumption; toast made at 1 is warmed
lightly.
</xs:documentation>
</xs:annotation>
xs:simpleType
<xs:restriction base="xs:unsignedInt">
<xs:minInclusive value="1"/>
<xs:maxInclusive value="10"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="toasterToastType" minOccurs="0">
xs:annotation
xs:documentation
This variable informs the toaster of the type of
material that is being toasted. The toaster
uses this information, combined with
toasterDoneness, to compute for how
long the material must be toasted to achieve
the required doneness.
</xs:documentation>
</xs:annotation>
xs:simpleType
<xs:restriction base="xs:QName">
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name="cancel-toast" substitutionGroup="nc:rpcOperation">
xs:annotation
xs:documentation
Stop making toast, if any is being made.
A 'resource-denied' error will be returned
if the toaster service is disabled.
</xs:documentation>
</xs:annotation>
xs:complexType
xs:complexContent
<xs:extension base="nc:rpcOperationType">
xs:sequence
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>
<xs:element name="toastDone" substitutionGroup="ncn:notificationContent">
xs:annotation
xs:documentation
Indicates that the toast in progress has completed.
</xs:documentation>
</xs:annotation>
xs:complexType
xs:complexContent
<xs:extension base="ncn:NotificationContentType">
xs:sequence
<xs:element name="toastStatus" minOccurs="0">
xs:annotation
xs:documentation
Indicates the final toast status
</xs:documentation>
</xs:annotation>
xs:simpleType
<xs:restriction base="xs:string">
<xs:enumeration value="done"/>
<xs:enumeration value="cancelled"/>
<xs:enumeration value="error"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:element>

</xs:schema>