<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<!-- The DOCTYPE should be as follows for metadata documents.
<!DOCTYPE jdo
    PUBLIC "-//Sun Microsystems, Inc.//DTD Java Data Objects Metadata 2.0//EN"
    "http://java.sun.com/dtd/jdo_2_0.dtd">
-->
<!ELEMENT jdo (extension*, (package|query)+, extension*)>
<!ATTLIST jdo catalog CDATA #IMPLIED>
<!ATTLIST jdo schema CDATA #IMPLIED>

<!ELEMENT package (extension*, (interface|class|sequence)+, extension*)>
<!ATTLIST package name CDATA ''>
<!ATTLIST package catalog CDATA #IMPLIED>
<!ATTLIST package schema CDATA #IMPLIED>

<!ELEMENT interface (extension*, datastore-identity?, primary-key?, inheritance?, version?, join*, foreign-key*, index*, unique*, property*, query*, fetch-group*, extension*)>
<!ATTLIST interface name CDATA #REQUIRED>
<!ATTLIST interface table CDATA #IMPLIED>
<!ATTLIST interface identity-type (datastore|application|nondurable) #IMPLIED>
<!ATTLIST interface objectid-class CDATA #IMPLIED>
<!ATTLIST interface requires-extent (true|false) 'true'>
<!ATTLIST interface detachable (true|false) 'false'>
<!ATTLIST interface embedded-only (true|false) #IMPLIED>
<!ATTLIST interface catalog CDATA #IMPLIED>
<!ATTLIST interface schema CDATA #IMPLIED>

<!ELEMENT property (extension*, (array|collection|map)?, join?, embedded?, element?, key?, value?, order?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST property name CDATA #REQUIRED>
<!ATTLIST property persistence-modifier (persistent|transactional|none) #IMPLIED>
<!ATTLIST property default-fetch-group (true|false) #IMPLIED>
<!ATTLIST property load-fetch-group CDATA #IMPLIED>
<!ATTLIST property null-value (default|exception|none) 'none'>
<!ATTLIST property dependent (true|false) #IMPLIED>
<!ATTLIST property embedded (true|false) #IMPLIED>
<!ATTLIST property primary-key (true|false) 'false'>
<!ATTLIST property value-strategy CDATA #IMPLIED>
<!ATTLIST property sequence CDATA #IMPLIED>
<!ATTLIST property serialized (true|false) #IMPLIED>
<!ATTLIST property field-type CDATA #IMPLIED>
<!ATTLIST property table CDATA #IMPLIED>
<!ATTLIST property column CDATA #IMPLIED>
<!ATTLIST property delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST property indexed (true|false|unique) #IMPLIED>
<!ATTLIST property unique (true|false) #IMPLIED>
<!ATTLIST property mapped-by CDATA #IMPLIED>
<!ATTLIST property recursion-depth CDATA #IMPLIED>
<!ATTLIST property field-name CDATA #IMPLIED>

<!ELEMENT class (extension*, implements*, datastore-identity?, primary-key?, inheritance?, version?, join*, foreign-key*, index*, unique*, column*, field*, property*, query*, fetch-group*, extension*)>
<!ATTLIST class name CDATA #REQUIRED>
<!ATTLIST class identity-type (application|datastore|nondurable) #IMPLIED>
<!ATTLIST class objectid-class CDATA #IMPLIED>
<!ATTLIST class table CDATA #IMPLIED>
<!ATTLIST class requires-extent (true|false) 'true'>
<!ATTLIST class persistence-capable-superclass CDATA #IMPLIED>
<!ATTLIST class detachable (true|false) 'false'>
<!ATTLIST class embedded-only (true|false) #IMPLIED>
<!ATTLIST class persistence-modifier (persistence-capable|persistence-aware|non-persistent) #IMPLIED>
<!ATTLIST class catalog CDATA #IMPLIED>
<!ATTLIST class schema CDATA #IMPLIED>

<!ELEMENT primary-key (extension*, column*, extension*)>
<!ATTLIST primary-key name CDATA #IMPLIED>
<!ATTLIST primary-key column CDATA #IMPLIED>

<!ELEMENT join (extension*, primary-key?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST join table CDATA #IMPLIED>
<!ATTLIST join column CDATA #IMPLIED>
<!ATTLIST join outer (true|false) 'false'>
<!ATTLIST join delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST join indexed (true|false|unique) #IMPLIED>
<!ATTLIST join unique (true|false) #IMPLIED>

<!ELEMENT version (extension*, column*, index?, extension*)>
<!ATTLIST version strategy CDATA #IMPLIED>
<!ATTLIST version column CDATA #IMPLIED>
<!ATTLIST version indexed (true|false|unique) #IMPLIED>

<!ELEMENT datastore-identity (extension*, column*, extension*)>
<!ATTLIST datastore-identity column CDATA #IMPLIED>
<!ATTLIST datastore-identity strategy CDATA 'native'>
<!ATTLIST datastore-identity sequence CDATA #IMPLIED>

<!ELEMENT implements (extension*, property*, extension*)>
<!ATTLIST implements name CDATA #REQUIRED>

<!ELEMENT inheritance (extension*, join?, discriminator?, extension*)>
<!ATTLIST inheritance strategy CDATA #IMPLIED>

<!ELEMENT discriminator (extension*, column*, index?, extension*)>
<!ATTLIST discriminator column CDATA #IMPLIED>
<!ATTLIST discriminator value CDATA #IMPLIED>
<!ATTLIST discriminator strategy CDATA #IMPLIED>
<!ATTLIST discriminator indexed (true|false|unique) #IMPLIED>

<!ELEMENT column (extension*)>
<!ATTLIST column name CDATA #IMPLIED>
<!ATTLIST column target CDATA #IMPLIED>
<!ATTLIST column target-field CDATA #IMPLIED>
<!ATTLIST column jdbc-type CDATA #IMPLIED>
<!ATTLIST column sql-type CDATA #IMPLIED>
<!ATTLIST column length CDATA #IMPLIED>
<!ATTLIST column scale CDATA #IMPLIED>
<!ATTLIST column allows-null (true|false) #IMPLIED>
<!ATTLIST column default-value CDATA #IMPLIED>
<!ATTLIST column insert-value CDATA #IMPLIED>

<!ELEMENT field (extension*, (array|collection|map)?, join?, embedded?, element?, key?, value?, order?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST field name CDATA #REQUIRED>
<!ATTLIST field persistence-modifier (persistent|transactional|none) #IMPLIED>
<!ATTLIST field field-type CDATA #IMPLIED>
<!ATTLIST field table CDATA #IMPLIED>
<!ATTLIST field column CDATA #IMPLIED>
<!ATTLIST field primary-key (true|false) 'false'>
<!ATTLIST field null-value (exception|default|none) 'none'>
<!ATTLIST field default-fetch-group (true|false) #IMPLIED>
<!ATTLIST field embedded (true|false) #IMPLIED>
<!ATTLIST field serialized (true|false) #IMPLIED>
<!ATTLIST field dependent (true|false) #IMPLIED>
<!ATTLIST field value-strategy CDATA #IMPLIED>
<!ATTLIST field delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST field indexed (true|false|unique) #IMPLIED>
<!ATTLIST field unique (true|false) #IMPLIED>
<!ATTLIST field sequence CDATA #IMPLIED>
<!ATTLIST field load-fetch-group CDATA #IMPLIED>
<!ATTLIST field recursion-depth CDATA #IMPLIED>
<!ATTLIST field mapped-by CDATA #IMPLIED>

<!ELEMENT foreign-key (extension*, (column* | field* | property*), extension*)>
<!ATTLIST foreign-key table CDATA #IMPLIED>
<!ATTLIST foreign-key deferred (true|false) #IMPLIED>
<!ATTLIST foreign-key delete-action (restrict|cascade|null|default|none) 'restrict'>
<!ATTLIST foreign-key update-action (restrict|cascade|null|default|none) 'restrict'>
<!ATTLIST foreign-key unique (true|false) #IMPLIED>
<!ATTLIST foreign-key name CDATA #IMPLIED>

<!ELEMENT collection (extension*)>
<!ATTLIST collection element-type CDATA #IMPLIED>
<!ATTLIST collection embedded-element (true|false) #IMPLIED>
<!ATTLIST collection dependent-element (true|false) #IMPLIED>
<!ATTLIST collection serialized-element (true|false) #IMPLIED>

<!ELEMENT map (extension)*>
<!ATTLIST map key-type CDATA #IMPLIED>
<!ATTLIST map embedded-key (true|false) #IMPLIED>
<!ATTLIST map dependent-key (true|false) #IMPLIED>
<!ATTLIST map serialized-key (true|false) #IMPLIED>
<!ATTLIST map value-type CDATA #IMPLIED>
<!ATTLIST map embedded-value (true|false) #IMPLIED>
<!ATTLIST map dependent-value (true|false) #IMPLIED>
<!ATTLIST map serialized-value (true|false) #IMPLIED>

<!ELEMENT key (extension*, embedded?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST key column CDATA #IMPLIED>
<!ATTLIST key table CDATA #IMPLIED>
<!ATTLIST key delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST key update-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST key indexed (true|false|unique) #IMPLIED>
<!ATTLIST key unique (true|false) #IMPLIED>
<!ATTLIST key mapped-by CDATA #IMPLIED>

<!ELEMENT value (extension*, embedded?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST value column CDATA #IMPLIED>
<!ATTLIST value table CDATA #IMPLIED>
<!ATTLIST value delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST value update-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST value indexed (true|false|unique) #IMPLIED>
<!ATTLIST value unique (true|false) #IMPLIED>
<!ATTLIST value mapped-by CDATA #IMPLIED>

<!ELEMENT array (extension*)>
<!ATTLIST array element-type CDATA #IMPLIED>
<!ATTLIST array embedded-element (true|false) #IMPLIED>
<!ATTLIST array dependent-element (true|false) #IMPLIED>
<!ATTLIST array serialized-element (true|false) #IMPLIED>

<!ELEMENT element (extension*, embedded?, column*, foreign-key?, index?, unique?, extension*)>
<!ATTLIST element column CDATA #IMPLIED>
<!ATTLIST element table CDATA #IMPLIED>
<!ATTLIST element delete-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST element update-action (restrict|cascade|null|default|none) #IMPLIED>
<!ATTLIST element indexed (true|false|unique) #IMPLIED>
<!ATTLIST element unique (true|false) #IMPLIED>
<!ATTLIST element mapped-by CDATA #IMPLIED>

<!ELEMENT order (extension*, column*, index?, extension*)>
<!ATTLIST order column CDATA #IMPLIED>
<!ATTLIST order mapped-by CDATA #IMPLIED>

<!ELEMENT fetch-group (extension*, (fetch-group|field|property)*, extension*)>
<!ATTLIST fetch-group name CDATA #REQUIRED>
<!ATTLIST fetch-group post-load (true|false) #IMPLIED>

<!ELEMENT embedded (extension*, (field|property)*, extension*)>
<!ATTLIST embedded owner-field CDATA #IMPLIED>
<!ATTLIST embedded null-indicator-column CDATA #IMPLIED>
<!ATTLIST embedded null-indicator-value CDATA #IMPLIED>

<!ELEMENT sequence (extension*)>
<!ATTLIST sequence name CDATA #REQUIRED>
<!ATTLIST sequence datastore-sequence CDATA #IMPLIED>
<!ATTLIST sequence factory-class CDATA #IMPLIED>
<!ATTLIST sequence strategy (nontransactional|contiguous|noncontiguous) #REQUIRED>

<!ELEMENT index (extension*, (column* | field* | property*), extension*)>
<!ATTLIST index name CDATA #IMPLIED>
<!ATTLIST index table CDATA #IMPLIED>
<!ATTLIST index unique (true|false) 'false'>

<!ELEMENT query (#PCDATA|extension)*>
<!ATTLIST query name CDATA #REQUIRED>
<!ATTLIST query language CDATA #IMPLIED>
<!ATTLIST query unmodifiable (true|false) 'false'>
<!ATTLIST query unique (true|false) #IMPLIED>
<!ATTLIST query result-class CDATA #IMPLIED>

<!ELEMENT unique (extension*, (column* | field* | property*), extension*)>
<!ATTLIST unique name CDATA #IMPLIED>
<!ATTLIST unique table CDATA #IMPLIED>
<!ATTLIST unique deferred (true|false) 'false'>

<!ELEMENT extension ANY>
<!ATTLIST extension vendor-name CDATA #REQUIRED>
<!ATTLIST extension key CDATA #IMPLIED>
<!ATTLIST extension value CDATA #IMPLIED>