How to fix element access_key is invalid error when validating XML?

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Hello,

i've written the following XML Schema to validate my custom XML:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="item" targetNamespace="http://www.tenforce.com/rest/item" 
           xmlns="http://www.tenforce.com/schema/item.xsd" 
           xmlns:xs="http://www.w3.org/2001/XMLSchema" 
           xmlns:ts="http://www.tenforce.com/rest/timestamp" 
           xmlns:st="http://www.tenforce.com/rest/schedulingtype" 
           xmlns:trl="http://www.tenforce.com/rest/timeregistrationlevel">
  <xs:import namespace="http://www.tenforce.com/rest/schedulingtype" schemaLocation="schedulingtype.xsd" />
  <xs:import namespace="http://www.tenforce.com/rest/timeregistrationlevel" schemaLocation="timeregistrationlevel.xsd" />
  <xs:import namespace="http://www.tenforce.com/rest/timestamp" schemaLocation="timestamp.xsd" />
  <xs:element name="item">
    <xs:complexType>
      <xs:all minOccurs="1" maxOccurs="1">
        <xs:element name="access_key" type="xs:string" nillable="true" />
        <xs:element name="account_code" type="xs:anyURI" nillable="true" />
        <xs:element name="activity" type="xs:anyURI" nillable="true" />
        <xs:element name="actual_budget" type="xs:decimal" />
        <xs:element name="actual_due_date" type="xs:dateTime" />
        <xs:element name="actual_due_time" type="xs:dateTime" />
        <xs:element name="actual_start_date" type="xs:dateTime" />
        <xs:element name="actual_start_time" type="xs:dateTime" />
        <xs:element name="allow_actual_effort_edit" type="xs:boolean" />
        <xs:element name="allow_edit_mode" type="xs:boolean" />
        <xs:element name="allow_timeregistration" type="xs:boolean" />
        <xs:element name="application" type="xs:anyURI" />
        <xs:element name="approval_status" type="xs:anyURI" />
        <xs:element name="billtype" type="xs:anyURI" />
        <xs:element name="child_sequence" type="xs:integer" />
        <xs:element name="closed_date" type="xs:dateTime" />
        <xs:element name="costs_invoiced" type="xs:boolean" />
        <xs:element name="description" type="xs:string" />
        <xs:element name="due_date" type="xs:string" />
        <xs:element name="duration_actual" type="xs:decimal" />
        <xs:element name="duration_estimate_to_complete" type="xs:decimal" />
        <xs:element name="duration_on_calendar" type="xs:decimal" />
        <xs:element name="duration_planned" type="xs:decimal" />
        <xs:element name="earliest_finish_date" type="xs:dateTime" />
        <xs:element name="earliest_start_date" type="xs:dateTime" />
        <xs:element name="editor" type="xs:anyURI" />
        <xs:element name="edited" type="xs:dateTime" />
        <xs:element name="external_reference" type="xs:boolean" />
        <xs:element name="has_multiple_owners" type="xs:boolean" />
        <xs:element name="fixed_due_date" type="xs:boolean" />
        <xs:element name="impact" type="xs:anyURI" />
        <xs:element name="internal_comment" type="xs:string" />
        <xs:element name="item_status" type="xs:anyURI" />
        <xs:element name="latest_finish_date" type="xs:dateTime" />
        <xs:element name="latest_start_date" type="xs:dateTime" />
        <xs:element name="list" type="xs:anyURI" />
        <xs:element name="list_counter" type="xs:integer" />
        <xs:element name="milestone" type="xs:boolean" />
        <xs:element name="mitigation_impact" type="xs:anyURI" />
        <xs:element name="mitigation_probability" type="xs:anyURI" />
        <xs:element name="mitigation_risk_accepted" type="xs:boolean" />
        <xs:element name="number_of_attachements" type="xs:integer" />
        <xs:element name="number_of_children" type="xs:integer" />
        <xs:element name="number_of_comments" type="xs:integer" />
        <xs:element name="number_of_parents" type="xs:integer" />
        <xs:element name="ongoing_since_date" type="xs:dateTime" />
        <xs:element name="origin_application_version" type="xs:anyURI" />
        <xs:element name="originator" type="xs:anyURI" />
        <xs:element name="owner" type="xs:anyURI" />
        <xs:element name="part_of_critical_path" type="xs:boolean" />
        <xs:element name="percent_complete" type="xs:integer" />
        <xs:element name="planned_budget" type="xs:decimal" />
        <xs:element name="planned_due_date" type="xs:dateTime" />
        <xs:element name="planned_end_time" type="xs:dateTime" />
        <xs:element name="planned_start_date" type="xs:dateTime" />
        <xs:element name="planned_start_time" type="xs:dateTime" />
        <xs:element name="priority" type="xs:anyURI" />
        <xs:element name="probability" type="xs:anyURI" />
        <xs:element name="risk_accepted" type="xs:boolean" />
        <xs:element name="scheduling_problem" type="xs:boolean" />
        <xs:element name="scheduling_type" type="st:SchedulingType" />
        <xs:element name="slack" type="xs:decimal" />
        <xs:element name="solution" type="xs:string" />
        <xs:element name="solution_application_version" type="xs:anyURI" />
        <xs:element name="source_date" type="xs:dateTime" />
        <xs:element name="source_event" type="xs:string" />
        <xs:element name="source_organization_unit" type="xs:anyURI" />
        <xs:element name="target_organization_unit" type="xs:anyURI" />
        <xs:element name="task_type" type="xs:string" />
        <xs:element name="template" type="xs:boolean" />
        <xs:element name="template_due_in" type="xs:string" />
        <xs:element name="template_item" type="xs:anyURI" />
        <xs:element name="time_registration_level" type="trl:TimeRegistrationLevel" />
        <xs:element name="timestamp" type="ts:TimeStamp" />
        <xs:element name="title" type="xs:string" />
        <xs:element name="validated" type="xs:boolean" />
      </xs:all>
    </xs:complexType>
  </xs:element>
</xs:schema>
 

I've created the following XML:

<?xml version="1.0" encoding="UTF-8" ?>
<item xmlns="http://www.tenforce.com/rest/item" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://localhost/arne/rest/schema/item.xsd">
<access_key></access_key>
<account_code>http://localhost/arne/rest/accountcode/</account_code>
<activity>http://localhost/arne/rest/activity/</activity>
<actual_budget></actual_budget>
<actual_due_date></actual_due_date>
<actual_due_time></actual_due_time>
<actual_start_date></actual_start_date>
<actual_start_time></actual_start_time>
<allow_actual_effort_edit>False</allow_actual_effort_edit>
<allow_edit_mode>True</allow_edit_mode>
<allow_timeregistration>False</allow_timeregistration>
<application>http://localhost/arne/rest/application/</application>
<approval_status>http://localhost/arne/rest/approvalstatus/</approval_status>
<billtype>http://localhost/arne/rest/billtype/</billtype>
<child_sequence></child_sequence>
<closed_date></closed_date>
<costs_invoiced>False</costs_invoiced>
<description></description>
<due_date></due_date>
<duration_actual>0.00</duration_actual>
<duration_estimate_to_complete>0.00</duration_estimate_to_complete>
<duration_on_calendar>0.00</duration_on_calendar>
<duration_planned>0.00</duration_planned>
<earliest_finish_date></earliest_finish_date>
<earliest_start_date></earliest_start_date>
<editor>http://localhost/arne/rest/user/</editor>
<edited></edited>
<external_reference></external_reference>
<has_multiple_owners>False</has_multiple_owners>
<fixed_due_date>False</fixed_due_date>
<impact>http://localhost/arne/rest/impact/</impact>
<internal_comment></internal_comment>
<item_status>http://localhost/arne/rest/itemstatus/15</item_status>
<latest_finish_date></latest_finish_date>
<latest_start_date></latest_start_date>
<list>http://localhost/arne/rest/list/18</list>
<list_counter>1</list_counter>
<milestone>False</milestone>
<mitigation_impact>http://localhost/arne/rest/mitigationimpact/</mitigation_impact>
<mitigation_probability>http://localhost/arne/rest/mitigationprobability/</mitigation_probability>
<mitigation_risk_accepted>False</mitigation_risk_accepted>
<number_of_attachements>0</number_of_attachements>
<number_of_children>0</number_of_children>
<number_of_comments>0</number_of_comments>
<number_of_parents>0</number_of_parents>
<ongoing_since_date>25/06/2010 09:29:35</ongoing_since_date>
<origin_application_version>http://localhost/arne/rest/applicationversion/</origin_application_version>
<originator>http://localhost/arne/rest/user/1</originator>
<owner>http://localhost/arne/rest/user/3</owner>
<part_of_critical_path>False</part_of_critical_path>
<percent_complete></percent_complete>
<planned_budget></planned_budget>
<planned_due_date></planned_due_date>
<planned_end_time></planned_end_time>
<planned_start_date></planned_start_date>
<planned_start_time></planned_start_time>
<priority>http://localhost/arne/rest/priority/6</priority>
<probability>http://localhost/arne/rest/probability/</probability>
<risk_accepted>False</risk_accepted>
<scheduling_problem>True</scheduling_problem>
<scheduling_type>NotDefined</scheduling_type>
<slack></slack>
<solution></solution>
<solution_application_version>http://localhost/arne/rest/applicationversion/</solution_application_version>
<source_date></source_date>
<source_event></source_event>
<source_organization_unit>http://localhost/arne/rest/organizationunit/</source_organization_unit>
<target_organization_unit>http://localhost/arne/rest/organizationunit/</target_organization_unit>
<task_type></task_type>
<template>False</template>
<template_due_in></template_due_in>
<template_item>http://localhost/arne/rest/item/</template_item>
<time_registration_level>0</time_registration_level>
<timestamp created="25/06/2010 09:29:35" modified="25/06/2010 09:29:39">
<creator>http://localhost/arne/rest/user/1</creator>
<modifier>http://localhost/arne/rest/user/1</modifier>
</timestamp>
<title>check parentfields</title>
<validated>False</validated>
</item>

But when I try to validate this XML i receive the error that the element access_key is invalid. What am I doing wrong?