[docs] Add Domain model implementation sub-section
This patch adds a new Glance domain model implementation sub-section to the Glance Background Concepts section. Change-Id: I74a4923f2ba1a52cfd2d9ac42a8571619ef0882a Co-Authored-By: Darja Shakhray <dshakhray@mirantis.com> Co-Authored-By: Olena Logvinova <ologvinova@mirantis.com>
This commit is contained in:
Olena Logvinova
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Copyright 2016 OpenStack Foundation
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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==================================
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Glance domain model implementation
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==================================
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Gateway and basic layers
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~~~~~~~~~~~~~~~~~~~~~~~~
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The domain model contains the following layers:
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#. :ref:`authorization`
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#. :ref:`notifier`
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#. :ref:`property`
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#. :ref:`policy`
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#. :ref:`quota`
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#. :ref:`location`
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#. :ref:`database`
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The schema below shows a stack that contains the Image domain layers and
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their locations:
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.. figure:: /images/glance_layers.png
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:figwidth: 100%
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:align: center
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:alt: Image domain layers
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.. _authorization:
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Authorization
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-------------
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The first layer of the domain model provides a verification of whether an
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image itself or its property can be changed. An admin or image owner can
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apply the changes. The information about a user is taken from the request
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``context`` and is compared with the image ``owner``. If the user cannot
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apply a change, a corresponding error message appears.
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.. _property:
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Property protection
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-------------------
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The second layer of the domain model is optional. It becomes available if you
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set the ``property_protection_file`` parameter in the Glance configuration
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file.
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There are two types of image properties in Glance:
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* *Core properties*, as specified in the image schema
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* *Meta properties*, which are the arbitrary key/value pairs that can be added
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to an image
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The property protection layer manages access to the meta properties
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through Glance’s public API calls. You can restrict the access in the
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property protection configuration file.
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.. _notifier:
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Notifier
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--------
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On the third layer of the domain model, the following items are added to
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the message queue:
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#. Notifications about all of the image changes
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#. All of the exceptions and warnings that occurred while using an image
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.. _policy:
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Policy
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------
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The fourth layer of the domain model is responsible for:
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#. Defining access rules to perform actions with an image. The rules are
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defined in the :file:`etc/policy.json` file.
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#. Monitoring of the rules implementation.
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.. _quota:
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Quota
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-----
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On the fifth layer of the domain model, if a user has an admin-defined size
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quota for all of his uploaded images, there is a check that verifies whether
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this quota exceeds the limit during an image upload and save:
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* If the quota does not exceed the limit, then the action to add an image
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succeeds.
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* If the quota exceeds the limit, then the action does not succeed and a
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corresponding error message appears.
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.. _location:
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Location
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--------
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The sixth layer of the domain model is used for interaction with the store via
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the ``glance_store`` library, like upload and download, and for managing an
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image location. On this layer, an image is validated before the upload. If
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the validation succeeds, an image is written to the ``glance_store`` library.
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This sixth layer of the domain model is responsible for:
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#. Checking whether a location URI is correct when a new location is added
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#. Removing image data from the store when an image location is changed
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#. Preventing image location duplicates
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.. _database:
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Database
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--------
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On the seventh layer of the domain model:
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* The methods to interact with the database API are implemented.
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* Images are converted to the corresponding format to be recorded in the
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database. And the information received from the database is
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converted to an Image object.
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|
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<y:SmartNodeLabelModel distance="4.0"/>
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</y:LabelModel>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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</y:StyleProperties>
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<y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="31.9375" modelName="custom" textColor="#000000" visible="true" width="132.42578125" x="49.287109375" y="2.271250000000009">Data Access
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db/sqlalchemy/api.py<y:LabelModel>
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<y:SmartNodeLabelModel distance="4.0"/>
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</y:LabelModel>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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<y:SmartNodeLabelModel distance="4.0"/>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:ModelParameter>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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<y:BorderStyle hasColor="false" type="line" width="1.0"/>
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<y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="17.96875" modelName="custom" textColor="#000000" visible="true" width="81.3671875" x="34.21640625000009" y="9.255625000000009">Glance Store<y:LabelModel>
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<y:SmartNodeLabelModel distance="4.0"/>
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</y:LabelModel>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:ModelParameter>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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</y:StyleProperties>
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</y:GenericNode>
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</data>
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<node id="n14">
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<data key="d6">
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<y:GenericNode configuration="BevelNode">
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<y:Geometry height="36.48000000000002" width="149.80000000000018" x="85.44000000000017" y="457.52000000000015"/>
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<y:Fill color="#99CCFF" transparent="false"/>
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<y:BorderStyle hasColor="false" type="line" width="1.0"/>
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<y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="17.96875" modelName="custom" textColor="#000000" visible="true" width="39.443359375" x="55.17832031250009" y="9.255625000000009">DBMS<y:LabelModel>
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<y:SmartNodeLabelModel distance="4.0"/>
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</y:LabelModel>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:ModelParameter>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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</y:StyleProperties>
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</y:GenericNode>
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</data>
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</node>
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<node id="n15">
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<data key="d6">
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<y:GenericNode configuration="BevelNode">
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<y:Fill color="#99CCFF" transparent="false"/>
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<y:BorderStyle color="#000000" type="dashed" width="1.0"/>
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<y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="31.9375" modelName="custom" textColor="#000000" visible="true" width="182.44140625" x="2.779296875" y="2.271250000000009">Property protection (optional)
|
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api/property_protections.py<y:LabelModel>
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<y:SmartNodeLabelModel distance="4.0"/>
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</y:LabelModel>
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<y:ModelParameter>
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<y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.0" nodeRatioX="0.0" nodeRatioY="0.0" offsetX="0.0" offsetY="0.0" upX="0.0" upY="-1.0"/>
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</y:ModelParameter>
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</y:NodeLabel>
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<y:StyleProperties>
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<y:Property class="java.lang.Boolean" name="ModernNodeShadow" value="true"/>
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</y:StyleProperties>
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</y:GenericNode>
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<y:LineStyle color="#000000" type="line" width="1.0"/>
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<y:Arrows source="none" target="standard"/>
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<y:BendStyle smoothed="false"/>
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</y:PolyLineEdge>
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<y:PolyLineEdge>
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<y:LineStyle color="#000000" type="line" width="1.0"/>
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<y:Arrows source="none" target="standard"/>
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<y:BendStyle smoothed="false"/>
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</y:PolyLineEdge>
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<data key="d10">
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<y:PolyLineEdge>
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<y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
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<y:LineStyle color="#000000" type="line" width="1.0"/>
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<y:Arrows source="none" target="standard"/>
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<y:BendStyle smoothed="false"/>
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<data key="d7">
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<y:Resources/>
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</data>
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</graphml>
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||||
|
|
@ -53,6 +53,7 @@ Glance Background Concepts
|
|||
architecture
|
||||
database_architecture
|
||||
domain_model
|
||||
domain_implementation
|
||||
identifiers
|
||||
statuses
|
||||
tasks
|
||||
|
|
|
|||
Loading…
Reference in New Issue