More documentation.

doc/bricks01.graphml

@@ -0,0 +1,261 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:java="http://www.yworks.com/xml/yfiles-common/1.0/java" xmlns:sys="http://www.yworks.com/xml/yfiles-common/markup/primitives/2.0" xmlns:x="http://www.yworks.com/xml/yfiles-common/markup/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:y="http://www.yworks.com/xml/graphml" xmlns:yed="http://www.yworks.com/xml/yed/3" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://www.yworks.com/xml/schema/graphml/1.1/ygraphml.xsd">
+  <!--Created by yEd 3.25.1-->
+  <key attr.name="Description" attr.type="string" for="graph" id="d0"/>
+  <key for="port" id="d1" yfiles.type="portgraphics"/>
+  <key for="port" id="d2" yfiles.type="portgeometry"/>
+  <key for="port" id="d3" yfiles.type="portuserdata"/>
+  <key attr.name="url" attr.type="string" for="node" id="d4"/>
+  <key attr.name="description" attr.type="string" for="node" id="d5"/>
+  <key for="node" id="d6" yfiles.type="nodegraphics"/>
+  <key for="graphml" id="d7" yfiles.type="resources"/>
+  <key attr.name="url" attr.type="string" for="edge" id="d8"/>
+  <key attr.name="description" attr.type="string" for="edge" id="d9"/>
+  <key for="edge" id="d10" yfiles.type="edgegraphics"/>
+  <graph edgedefault="directed" id="G">
+    <data key="d0"/>
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+        <y:ShapeNode>
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+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" raised="false" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="59.76438903808594" x="15.117805480957031" y="6.155885696411133">book0001
+[Artifact]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+          <y:Shape type="roundrectangle"/>
+        </y:ShapeNode>
+      </data>
+    </node>
+    <node id="n1">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.document">
+          <y:Geometry height="40.0" width="102.0" x="537.0" y="306.0808601379399"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="71.75247192382812" x="15.123764038085938" y="1.6558856964111328">page001.tiff
+[File]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n2">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.predefinedProcess">
+          <y:Geometry height="49.0" width="90.0" x="361.0" y="301.5808601379399"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="52.852325439453125" x="18.573837280273438" y="6.155885696411133">page001
+[Brick]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n3">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.document">
+          <y:Geometry height="40.0" width="102.0" x="626.0" y="416.0808601379399"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="71.75247192382812" x="15.123764038085938" y="1.6558856964111328">page002.tiff
+[File]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n4">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.predefinedProcess">
+          <y:Geometry height="49.0" width="90.0" x="450.0" y="411.5808601379399"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="52.852325439453125" x="18.573837280273438" y="6.155885696411133">page002
+[Brick]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n5">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.document">
+          <y:Geometry height="40.0" width="102.0" x="730.0" y="524.4705734252933"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="71.75247192382812" x="15.123764038085938" y="1.6558856964111328">page003.tiff
+[File]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
+              <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"/>
+            </y:ModelParameter>
+          </y:NodeLabel>
+        </y:GenericNode>
+      </data>
+    </node>
+    <node id="n6">
+      <data key="d6">
+        <y:GenericNode configuration="com.yworks.flowchart.predefinedProcess">
+          <y:Geometry height="49.0" width="90.0" x="554.0" y="519.9705734252933"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="12" fontStyle="plain" hasBackgroundColor="false" hasLineColor="false" height="36.688228607177734" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="52.852325439453125" x="18.573837280273438" y="6.155885696411133">page003
+[Brick]<y:LabelModel>
+              <y:SmartNodeLabelModel distance="4.0"/>
+            </y:LabelModel>
+            <y:ModelParameter>
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+          </y:NodeLabel>
+        </y:GenericNode>
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+    </node>
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+      <data key="d10">
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+          <y:LineStyle color="#000000" type="line" width="1.0"/>
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+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e1" source="n0" target="n2">
+      <data key="d10">
+        <y:PolyLineEdge>
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+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="delta"/>
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+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e2" source="n4" target="n3">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="delta"/>
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+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e3" source="n2" target="n4">
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+        </y:PolyLineEdge>
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+    </edge>
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+      <data key="d10">
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+          <y:LineStyle color="#000000" type="line" width="1.0"/>
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+  <data key="d7">
+    <y:Resources/>
+  </data>
+</graphml>

doc/bricks02.graphml

@@ -0,0 +1,407 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+  <!--Created by yEd 3.25.1-->
+  <key attr.name="Description" attr.type="string" for="graph" id="d0"/>
+  <key for="port" id="d1" yfiles.type="portgraphics"/>
+  <key for="port" id="d2" yfiles.type="portgeometry"/>
+  <key for="port" id="d3" yfiles.type="portuserdata"/>
+  <key attr.name="url" attr.type="string" for="node" id="d4"/>
+  <key attr.name="description" attr.type="string" for="node" id="d5"/>
+  <key for="node" id="d6" yfiles.type="nodegraphics"/>
+  <key for="graphml" id="d7" yfiles.type="resources"/>
+  <key attr.name="url" attr.type="string" for="edge" id="d8"/>
+  <key attr.name="description" attr.type="string" for="edge" id="d9"/>
+  <key for="edge" id="d10" yfiles.type="edgegraphics"/>
+  <graph edgedefault="directed" id="G">
+    <data key="d0"/>
+    <node id="n0">
+      <data key="d6">
+        <y:ShapeNode>
+          <y:Geometry height="49.0" width="90.0" x="271.0" y="221.5808601379399"/>
+          <y:Fill color="#CAEC64" color2="#99CC00" transparent="false"/>
+          <y:BorderStyle color="#3F5400" raised="false" type="line" width="1.0"/>
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+[Artifact]<y:LabelModel>
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doc/bricks03.graphml

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doc/bricks_coll.graphml

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+          <y:EdgeLabel alignment="center" backgroundColor="#FFFFFF" configuration="AutoFlippingLabel" distance="0.0" fontFamily="Dialog" fontSize="12" fontStyle="plain" height="20.344114303588867" horizontalTextPosition="center" iconTextGap="4" lineColor="#000000" modelName="center_slider" preferredPlacement="center_on_edge" ratio="0.5" textColor="#000000" verticalTextPosition="bottom" visible="true" width="19.852127075195312" x="33.062705993652344" y="-10.172064781188624">ref<y:PreferredPlacementDescriptor angle="0.0" angleOffsetOnRightSide="0" angleReference="absolute" angleRotationOnRightSide="co" distance="-1.0" placement="center" side="on_edge" sideReference="relative_to_edge_flow"/>
+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e5" source="n4" target="n6">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0">
+            <y:Point x="495.0" y="544.4705734252933"/>
+          </y:Path>
+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="delta"/>
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+    </edge>
+    <edge id="e6" source="n0" target="n1">
+      <data key="d10">
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+          <y:LineStyle color="#000000" type="line" width="1.0"/>
+          <y:Arrows source="none" target="delta"/>
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+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+    <edge id="e7" source="n0" target="n3">
+      <data key="d10">
+        <y:PolyLineEdge>
+          <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"/>
+          <y:Arrows source="none" target="delta"/>
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+          <y:BendStyle smoothed="false"/>
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+          </y:EdgeLabel>
+          <y:BendStyle smoothed="false"/>
+        </y:PolyLineEdge>
+      </data>
+    </edge>
+  </graph>
+  <data key="d7">
+    <y:Resources/>
+  </data>
+</graphml>

doc/content_model.md → doc/content_model_manual.md

@@ -1,8 +1,10 @@
-# Content model configuration
+# Content modeling manual
 
 *Audience: system administrators, developers*
 
-**WORK IN PROGRESS**
+For a generic introduction to content modeling in Pocket Archive, see
+the [content modeling primer](./content_model_primer.md)
+## Predefined content types
 
 Pocket Archive ships with some predefined content types. For some very simple
 archives, this may be enough to get started with little or no customization.
@@ -30,7 +32,12 @@ can put it under Anything. Of course, if one starts dealing with many
 unclassifiable resources that look similar, it's probably best to define a
 model for them; but that is not mandatory.
 
-**Insert root types info here**
+In addition to these three *mandatory* components, a property can have an
+optional description. This, when present, shows in the presentation as an
+"info" icon and a pop-up with a concise explanation of the property's scope and
+purpose.
+
+## Constraints
 
 Each metadata field can be specified by constraints. These constraints can be
 on:

doc/content_model_primer.md

@@ -0,0 +1,305 @@
+# Content modeling primer
+
+*Audience: Archivists, system administrators*
+
+**WORK IN PROGRESS**
+
+Terms in **bold** are referenced in the [glossary](./glossary.md).
+
+This document is a general-purpose introduction to content modeling concepts in
+Pocket Archive. For detailed technical information on how to set up a content
+model for a Pocket Archive instance, see the [content modeling
+manual](./content_model_manual.md)
+
+## Content model and types
+
+**Content modeling** refers to the configuration of an information system, such
+as Pocket Archive, with the goal of instructing the system how it should
+understand and handle user-supplied contents.
+
+The term "content model" has various meanings in the libraries and archives
+world. In the context of Pocket Archive, a content model is the complete set of
+definitions of **content types**, their **properties**, and the relationships
+between them, sometimes also called an **ontology**. There is one and only one
+content model for each installation of Pocket Archive.
+
+In addition to defining semantic structures, the Pocket Archive content model
+defines operational behaviors, for example how to generate presentation
+derivatives for certain content types.
+
+A **content type** is a single content category in a content model. Each
+resource must be assigned one and only one primary content type.
+
+A **schema** is a machine-readable document, made up of configuration files
+that describe all the semantic and behavioral aspects of a content type.
+
+## Type inheritance
+
+Content types are hierarchical, starting with a single common archtype, called
+"Anything", which is refined into broad categories, and further into more
+specific categories.
+
+![Screenshot of a portion of a Pocket Archive presentation page, with the tpe
+hierarchy visible in the "Classification"
+section.](./pkar_screenshot_classification.png)
+
+This hierarchy is visible in the **presentation** page of a **resource**, e.g.
+an **Artifact** of type "Still Image". The page has a "Classification" section
+with a chain of links, such as: "Anything ➳ Artifact ➳ Still Image". This means
+that the resource being viewed has a "Still Image" primary type (the most
+specific type), which is a specialization of "Artifact", which is in its turn a
+specialization of "Anything". Searching for all Still Images will find this
+resource. Also searching for Artifacts, or for Anything, will find this
+resource. [WIP note: the links in the classification are not yet working.
+Eventually they will resolve to listings of all resources in a given content
+type.]
+
+In other words, each content type inherits common **properties** from a broader
+type and may add more properties specific only to that type.
+
+For example, we define a Postcard type as a sub-type of Artifact. Artifact has
+some properties such as author, location, date, etc. It also has an `has file`
+relationship that allows the artifact to be related to any files. The Postcard
+type will inherit all these properties automatically and there is no need to
+redefine them.
+
+We can add more properties to the Postcard type, e.g. an `inscription` property
+that contains text inscribed on the object. We can also add `has_recto` and
+`has_verso` relationships with **Bricks** representing the two faces of the
+postcard. Finally, we can re-define the `has_file` property to restrict the
+relationship to a sub-tye of `File`, e.g. `StillImage`. All these properties
+are only available to the Postcard type and its sub-types (if any are defined).
+
+If we later decide that all artifacts need a new property, e.g. `description`,
+we can add that to the Artifact type, and the Postcard type and all other sub-
+types of Artifact will automatically inherit it.
+
+This method allows to create both simple and complex hierarchies of content
+types, and keep them manageable.
+
+## Foundational types
+
+Pocket Archive supports the customization of the content model for each of its
+running instances, even for multiple instances running on the same machine from
+the same code base, if they point to different configurations. Some schemata
+that make up the foundations of the Pocket Archive content model, are already
+provided and unchangeable. Pocket Archive relies on these schemata for some of
+its basic functionality.
+
+The fundamental type is `Anything`. As the name suggests, all resources in the
+system ultimately belong to this type. `Anything` sets some basic properties
+that cannot be redefined, such as `id` or `source_path`, and others that are
+added for convenience and may be redefined in sub-types.
+
+`Anything` has three immediate child types: `Artifact`, `File`, and `Brick`.
+These types may be used as primary types for resources, but more likely, their
+child types may be used.
+
+**Artifact** is a digital surrogate of a physical and/or intellectual object,
+such as a photograph, a video, a letter, a painting, etc. This resource
+contains data related to the subject, content, author, taxonomy, etc. of the
+intellectual work.
+
+File is a digital capture or document related to an artifact. The file is
+accompanied by a **metadata** resource, which is automatically generated fom
+the metadata that the archivist enters in the laundry list. These metadata
+should be exclusively about the file itself, e.g. time of creation, file
+size, file type, etc, as well as how the file relates to the artifact (e.g.
+detail shot, documentation, transcript, 3/4 view, etc) or other files. Some
+of these metadata are generated automatically by analyzing the file during
+the submission process. Information about the artifact itself goes exclusively
+into the artifact resource.
+
+**Brick** is a structural element used to build logical structures with
+multiple resources. Bricks can represent many things: the ordering of chapters
+and pages in a book, front and back sides of a postcard or a vinyl record, the
+ordering of artifacts and collections in a collection, etc. They may have any
+kind of metadata, and/or they may reference an artifact or file, that they
+"stand in" for. They are mostly automatically generated by the submission
+process, and are mostly hidden in the **presentation**, but they can be
+explicitly created in a laundry list to create specific structures.
+
+### Bricks as structural tools
+
+The use of bricks for ordering purposes is worth spending some extra words.
+While some objects may look naturally ordered, such as the pages in a book,
+other abstract entities, such as collections, may be created from resources in
+other collections. The resources in the collection cannot have an ordering
+number of their own if they are owned by multiple collections, and for this
+reason, bricks are used to provide ordered stand-ins.
+
+Bricks can be used for this purpose in a variety of way. A very simple use case
+is illustrated below:
+
+![Ordering of pages in a book using Bricks.](bricks01.png)
+
+In this example, a book resource (an Artifact) contains some ordered pages
+represented by Files. Note that there is a direct relationship between the
+artifact and its files, because the files are directly related to the content
+of the book. There are also indirect relationships going from the book to the
+page structural elements (Bricks), which provide an ordering (via `first` and
+`next` properties) and reference (`ref`) the files which they represent.
+
+This example is contrived, as we could have just as easily pointed the `first`
+relationship from the book to the first file, and the `next` one from one
+file to the next. But, what if we have multiple files per page:
+
+![Ordering of multi-file pages in a book using Bricks.](bricks02.png)
+
+In this case, closer to a real archival scenario, we have an **archival
+master** file, a **production master** file, and a transcript text file. A
+single-file ordering wouldn't work here, so, a sub-type of Brick is used to
+represent a page. Each Page resource can contain metadata about its content and
+position in the book, and groups all the files related to a page, each with a
+specific relationship (`has_pres`, `has_prod`, `has_tx`) so that they can be
+clearly tracked.
+
+A more complex example, less common because it is more laborious to set up,
+but entirely possible, involves an Artifact resource that has multiple
+structures, such a full book and its excerpt:
+
+![Complex ordering example using multiple structures.](bricks03.png)
+
+In this case, in addition to the Page resources of the previous example, we
+have an additional layer of bricks only to keep ordering. The pages keep their
+role as representatives of the content of the pages and groupings of related
+files, but they have no ordering information. This is delegated to two sets of
+bricks, one defining the ordering for the full book (pages 1÷3), the other for
+the excerpt (pages 2÷3, which in the excerpt are numbered 1 and 2).
+
+This use case is seldom used for books, especially in large collections where
+setting up multiple orderings for individual artifacts is not practical, but it
+may be very useful in building collections by "borrowing" already submitted
+resources that belong to another collection. The `coll2` row in the [example
+laundry list](../test/sample_submission/pkar_submission-demo.csv) does exactly
+that within a couple of lines. Pocket Archive takes care of creating the
+appropriate bricks.
+
+## Assigning content types
+
+Each resource is assigned one and only one content type. This is done by
+setting the `content_type` property to one of the available type codenames.
+
+There is no need to define a specific content type for every object in the
+archive. Only if enough resources sharing similar characteristics start
+populating the archive, and there is a need to set them apart from other
+rsources, a new type may be created.
+
+If one-off items are acquired, it is mostly fine to classify as the most
+fitting type at hand. For example, if a Book and a Manuscript types are defined
+that inherit from Artifact -> Text, and one has a flyer to catalog, one can
+assign Text as the type because a flyer does not fit within either of the more
+specific types. This should be done in exceptional cases: assigning a very
+broad type to a resource results in loss of information and specificity, and if
+done habitually, it makes for a poorly usable archive.
+
+While content types can be added, removed, and updated at any time, some times
+this implies updating all the resources that belong to those types, which can
+be laborious. The initial type hierarchy should be carefully evaluated before
+starting to populate the archive in order to minimize such labor.
+
+## Properties
+
+Properties are bits of data attached to an individual resource. They can be
+descriptive, such as "label", "description", "author"; structural, such as "has
+parent", "has relationship", "has next sibling"; technical, such as "file
+size", "MIME type", "checksum"; etc.
+
+The content model defines which properties can be assigned to which content
+type. It can also define how many values a property can have, which data type
+it should be (string, number, date, relationship, etc.), and other aspects.
+Not all of these details are always defined for all properties; in fact, many
+properties are usually not too strictly defined. This is a primarily curatorial
+decision that should be made while setting up the system, and further refined
+with usage over time.
+
+### Setting properties
+
+Only properties that are defined in the resource **schema** can be added to a
+resource. Tools [WIP] shall be made available to write out the complete schema
+of a given instance of Pocket Archive to a file, that can be used as a
+reference.
+
+The only system-mandated properties for all resources are `content_type` and,
+for files, `source_path`. `content_type` determines the schema to be
+applied to the resources, and the rules applicable to all other properties.
+
+### Property names and codes
+
+Properties have a few names and identifiers:
+
+1. A codename, which is normally made of lowercase letters, numbers, and
+   underscores, e.g., `file_size`.  This is an identifier used by archivists in
+   the laundry list header. It must be unique for each property.
+2. A human readable description, which is what shows in the **presentation**
+   when resource properties are listed. This should be a concise label starting
+   with a capital letter, e.g., "File size".
+3. A **URI**, which is mostly hidden from archivists and end users, but is a
+   fundamental **Linked Data** building block ensuring that the property is
+   globally unique. Most users need not be concerned with the URI for ordinary
+   operations.
+
+### Property constraints
+
+Properties can be wide open, i.e. they accept any (or no) values, or they can
+be more or less strictly constrained. The advantage of constraining properties
+is that increases relevance and accuracy of search results: for example, by
+defining `image_height` as a number rather than a generic string, it is
+possible to find all images with a height of less than 1000 pixels. Or, by
+constraining the allowed values to a **controlled vocabulary** prevents
+confusion. For example, if the `is_published` property is meant to be a
+true/false value, by constraining the range of values to `true` and `false` we
+can avoid having `yes`, `Yes`, `YES`, `y`, `Y`, `1`, `t`, `TRUE`, `published`,
+etc., entered instead of the intended value (YES, it does happen).
+
+On the other hand, a too constrained property can make cataloging and archiving
+difficult, especially if a one-off case comes up that doesn't fit some imposed
+constraints. Which properties get constrained and how is a curatorial decision.
+
+Below are brief descriptions of the different types of constraints supported
+by Pocket Archive. This information is mainly useful to archivists. When a
+submission undergoes **validation** (explained further below), errors may show
+that require adjusting the metadata according to the defined constraints.
+Understanding the constraints may help fixing the errors. Details on how to
+define these constraints are in the [Content modeling
+manual](./content_model_manual.md)
+
+#### Type
+
+This constraint defines what kind of data may be entered for a property. It
+can be a string (pretty much any text is fine); a number; a date (which is a
+string formatted in a particular way); a relationship; or a URL. More types may be
+added at later stages of Pocket Archive development.
+
+The URL type is regarded as a string for constraint purposes, but it is treated
+especially in the presentation, where it will show as a hyperlink. The
+archivist is responsible for ensuring that the hyperlink points to a valid
+location. A good archival practice is to point to a [Wayback
+Machine](https://web.archive.org/) URL if available, which allows the archivist
+to display the page "frozen" at the time of the submission, before it might
+altered or taken down altogether.
+
+The property type also results in a hyperlink, but it is used only for
+resources managed by the archive. In a laundry list, a resource ID is used, or
+lacking that, the `source_path` of the related resource (which will be replaced
+by the submission process with a generated ID). Once validated and archived,
+Pocket Archive guarantees that the relationship remains sound. System-defined
+properties such as `has_member`, `has_preferred_representation`, etc. are
+resource type properties.
+
+#### Cardinality
+
+Cardinality is the number of values that a property can have on any resource.
+Minimum and maximum cardinality can be defined to cover a wide range of
+scenarios: a minimum cardinality of 1, for example, means that at least one
+value must be provided, which means, that property is *mandatory*. A maximum
+cardinality of 1 means that the property is *single-valued*; etc.
+
+### Range
+
+[NOTE: not yet implemented]
+
+The range of a property depends on its data type: for a number or a date, it
+can be a minimum and/or maximum value; for a string, a specific pattern can be
+defined; for a resource type, the content type(s) of the resources pointed to
+can be restricted.

doc/glossary.md

@@ -50,6 +50,8 @@ via the `has_member` **property**.
 
 ## \*Content type
 
+## \*Content type definition
+
 ## CSV
 
 Stands for Comma-Separated Values. It is a file format for tabular data, which
@@ -80,6 +82,10 @@ application file (usually employed by the "Save" command).
 
 ## Metadata
 
+## Ontology
+
+See **Content model**.
+
 ## \*Opaque resource
 
 ## \*Presentation file
@@ -117,6 +123,32 @@ existence, Pocket Archive guarantees the consistency of relationship links.
 
 ## RDF
 
+Acronym for [Resource Description
+Framework](https://www.w3.org/TR/rdf11-primer/). It is the data format used for
+**Linked Data**.
+
+Pocket Archive uses RDF internally and is able to export RDF for
+interoperability with external systems. End users and content managers need not
+be concerned with the internals of RDF, but it is good to have an awareness of
+the underlying support for this format.
+
+RDF was designed by Tim Berners-Lee, the "father of the Internet", and it is a
+format expressly made for the WWW. In RDF, everything is a **resource**,
+represented by a Web document, that can be identified globally by a **URI**.
+This format is particularly fit for aggregating and sharing data sets from
+heteroeneous sources, that may have been cataloged according to different
+standards, using different tools.
+
+Pocket Archive uses RDF to maintain a flexible method to relate resources
+together and to facilitate sharing its data in the wild.
+
+## Schema (pl. schemata)
+
+The complete set of rules governing a given **content type**. A schema defines
+all the **properties** applicable to a specific type and their constraints. It
+is written out as a set of files that include the content type in question and
+all its super-types.
+
 ## SIP
 
 Submission Information Package: a package of files, folders, and **metadata**

doc/roadmap.md

@@ -62,8 +62,11 @@ usage and opportunities for expanding adoption in relevant areas.
   - ✓ Dump archive RDF
   - ❏ Backup full environment (including config)
   - ❏ Restore whole archive from RDF & data folder
+- ❏ Submission
+  - ❏ Deleting resources
 - ❏ Content model
   - ❏ Multilingual support
+  - ❏ Content model dump for users (CSV?)
   - ❏ Local overrides
   - ❏ Relatioships inference
   - ❏ Markdown support for individual fields
@@ -83,10 +86,12 @@ usage and opportunities for expanding adoption in relevant areas.
     - ⚒ >100 resource data set
 - ⚒ Documentation
   - ✓ Break main sections off README
+  - ✓ Watchdog process guide
   - ⚒ Submission guide
+  - ⚒ Content modeling primer (archivist)
+  - ⚒ Content modeling manual (sysadmin)
+  - ⚒ Glossary
   - ❏ Site generation guide
-  - ❏ Watchdog process guide
-  - ❏ Content modeling guide (including proxy concepts)
 
 ## Post-release
 

doc/submission.md

@@ -342,33 +342,13 @@ re-submission.
 #### Resource types and sub-types
 
 This chapter is a very concise introduction to content modeling in Pocket
-Archive, which is treated in detail in the [Content modeling guide
-(WIP)](./content_model.md). It is strongly recommended to read that guide
-before archiving resources in earnest.
-
-The three main resource types found in a submission are:
-
-- **Artifact**: the digital surrogate of a physical and/or intellectual object,
-  such as a photograph, a video, a letter, a painting, etc. This resource
-  contains data related to the subject, content, author, taxonomy, etc. of the
-  intellectual work.
-- File: a digital capture or document related to an artifact. The file is
-  accompanied by a **metadata** resource, which is automatically generated fom
-  the metadata that the archivist enters in the laundry list. These metadata
-  should be exclusively about the file itself, e.g. time of creation, file
-  size, file type, etc, as well as how the file relates to the artifact (e.g.
-  detail shot, documentation, transcript, 3/4 view, etc) or other files. Some
-  of these metadata are generated automatically by analyzing the file during
-  the submission process. Information about the artifact itself go exclusively
-  on the artifact resource.
-- **Brick**: a structural element used to build logical, hierarchical
-  structures with multiple resources. Bricks can represent many things: the
-  ordering of chapters and pages in a book, front and back sides of a postcard
-  or a vinyl record, the ordering of artifacts and collections in a collection,
-  etc. They have no intellectual content themselves, but they can reference an
-  artifact or file. They are mostly automatically generated by the submission
-  process, and are mostly hidden in the **presentation**, but they can be
-  explicitly created in a laundry list to create specific structures.
+Archive, which is treated in detail in the [Content modeling
+primer](./content_model_primer.md). It is strongly recommended to read that
+guide before archiving resources in earnest.
+
+The three main resource types found in a submission are: Artifact, File, and
+Brick. See the [content modeling primer](./content_model_primer.md) for more
+information about these.
 
 These three key content types are seldom used as-is. They usually have
 sub-types, which are defined in the content model. See the content modeling
@@ -380,11 +360,11 @@ object, e.g. a photograh. `still_image_file` may be the capture (e.g. scan) of
 that object, but also the capture of a `text` artifact if it is the scan of a
 book page.
 
-Also see the [sample laundry
+See the provided [sample laundry
 list](../test/sample_submission/pkar_submission-demo.csv) for examples of
-artifacts, files, and bricks making up a two-sided postcard. (Note: download
-file and open it with a spreadsheet editor. The current platform shows the
-raw file.)
+artifacts, files, and bricks making up a two-sided postcard. (Note: you may
+need to download the file and open it with a spreadsheet editor. The current
+platform shows the raw file.)
 
 ### Submission ID and submission name
 
@@ -399,8 +379,8 @@ A submission can also have a name, which is optional and user-defined. The
 submission name is determined by the file name used for the laundry list. E.g.
 `pkar_submission-my_new_collection.csv` will use `my_new_collection`, i.e. the
 text between `pkar_submission-` and `.csv`, as the submission name. Submisson
-names are not required to be unique, but they can contain for example a date to
-facilitate their search.
+names are not required to be unique. Of course, the laundry list file names
+must be unique in the drop box they are deposited to.
 
 ### Update
 
@@ -411,18 +391,18 @@ a full representation of each of the resources updated.
 To facilitate this task while avoiding the need to hold on to all of the
 archive's laundry lists, Pocket Archive can generate a laundry list for one or
 more selected resources. This list, which represents the current state of the
-resources requested, can be edited and submitted for an update. 
+resources requested, can be edited and re-submitted for an update.
 
-### Shortcuts
+### Advanced techniques
 
-Some shortcuts are available to facilitate the management of larger
-submissions.
+Some hidden tricks can be employed to facilitate the creation and management of
+larger submissions.
 
 #### Implicit resources
 
 TODO
 
-#### ID generation
+#### Bulk ID generation
 
 As mentioned before, explicitly adding IDs in a laundry list simplifies later
 editing and management. However, this is one of the most tedious parts of a