Removed compatibility constraints on inherited values

metadata/index.html

@@ -1091,75 +1091,66 @@ <h2>Inherited Properties</h2>
         <p>
           A <a href="http://w3c.github.io/csvw/syntax/#dfn-cell" class="externalDFN">cell</a> may be assigned annotations based on properties on the description objects for the <a title="table group description">group of tables</a>, <a title="table description">table</a>, <a title="schema description">schema</a>, or <a title="column description">column</a> that it appears in. These properties are known as <dfn title="inherited property">inherited properties</dfn> and are listed below. To ascertain a value for certain annotations on cells, an application MUST identify the relevant property in the descriptions of the group of tables, table, schema, or column.
         </p>
-        <p>
-          Applications MUST raise an error if the value of a property in a <a>table description</a> is not <a>compatible with</a> the value of that property on the <a>table group description</a> it appears in. Applications MUST raise an error if the value of a property in a <a>schema description</a> is not <a>compatible with</a> the value of that property on the <a>table description</a> and <a>table group description</a> it appears in. Applications MUST raise an error if the value of a property in a <a>column description</a> is not <a>compatible with</a> the value of that property in the <a>schema description</a>, <a>table description</a>, and/or <a>table group description</a> it appears in.
-        </p>
-        <p>
-          A value for an <a>inherited property</a> on a column or table description is <dfn>compatible with</dfn> with an inherited value on the same property on a table or table group description if they are the same value or if the first value is a sub-value of the second value. The definitions of individual <a title="inherited property">inherited properties</a> indicate what values count as sub-values of others.
-        </p>
         <dl>
           <dt id="cell-aboutUrl"><code>aboutUrl</code></dt>
           <dd>
-            <p>A <a>URI template property</a> that MAY be used to create a unique identifier for each cell within a row when mapping data to other formats. There are no <a title="compatible with">compatibility restrictions</a> on this property. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-about-url" class="externalDFN">about URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>,.</p>
+            <p>A <a>URI template property</a> that MAY be used to create a unique identifier for each cell within a row when mapping data to other formats. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-about-url" class="externalDFN">about URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>,.</p>
             <p class="note"><code>aboutUrl</code> is typically defined on a <a>schema description</a> or <a>table description</a>. If defined on individual <a title="column description">column descriptions</a>, care must be taken to ensure that transformed cell values maintain a semantic relationship.</p>
           </dd>
           <dt id="cell-datatype"><code>datatype</code></dt>
           <dd>
             <p>
               An <a>atomic property</a> that contains either a single string that is the main datatype of the values of the cell or a <a>datatype description</a> object. If the value of this property is a string, it MUST be one of the built-in datatypes defined in <a href="#built-in-datatypes" class="sectionRef"></a>; if it is an object then it describes a more specialised datatype. If a cell contains a sequence (ie the <code>separator</code> property is specified and not <code>null</code>) then this property specifies the datatype of each value within that sequence. See <a href="#datatypes"></a> for more details.
             </p>
-            <p>
-              A value for this property is <a>compatible with</a> an inherited value if they are identical, or if the value is a subtype within the datatype hierarchy defined in <a href="#datatypes" class="sectionRef"></a>, including if the inherited value is explicitly specified as the <a href="#datatype-base"><code>base</code></a> of this value.
-            </p>
             <p>The <a title="normalization">normalized</a> value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-datatype" class="externalDFN">datatype</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
             <p class="issue" data-number="223">We invite comment on whether <a href="#cell-datatype"><code>datatype</code></a> should allow for a "union" of types for a cell; this would allow for a set of datatypes that could be matched against the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-string-value" class="externalDFN">string value</a> of a cell, choosing the first match; e.g., to match either a <code>date</code> or <code>datetime</code>.</p>
           </dd>
           <dt id="cell-default"><code>default</code></dt>
           <dd>
             <p>
-              An <a>atomic property</a> holding a single string that is used to create a default <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-value" class="externalDFN">value</a> for the cell in cases where the original <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-string-value" class="externalDFN">string value</a> is an empty string. This default value MAY be used when converting the table into other formats, or when the table is displayed. If not specified, the default for the <code>default</code> property is the empty string, <code>""</code>. A value for this property is <a>compatible with</a> an inherited value only if they are identical. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-default" class="externalDFN">default</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
+              An <a>atomic property</a> holding a single string that is used to create a default <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-value" class="externalDFN">value</a> for the cell in cases where the original <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-string-value" class="externalDFN">string value</a> is an empty string. This default value MAY be used when converting the table into other formats, or when the table is displayed. If not specified, the default for the <code>default</code> property is the empty string, <code>""</code>. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-default" class="externalDFN">default</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
             </p>
           </dd>
           <dt id="cell-language"><code>lang</code></dt>
           <dd>
             <p>
-              An <a>atomic property</a> giving a single string language code as defined by [[!BCP47]]. Indicates the language of the value within the cell. A value for this property is <a>compatible with</a> an inherited value if it is a sub-language of the inherited value; for example <code>en-US</code> is compatible with <code>en</code> but not <code>fr</code>. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-lang" class="externalDFN">lang</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
+              An <a>atomic property</a> giving a single string language code as defined by [[!BCP47]]. Indicates the language of the value within the cell. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-lang" class="externalDFN">lang</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
             </p>
           </dd>
           <dt id="cell-null"><code>null</code></dt>
           <dd>
             <p>
-              An <a>atomic property</a> giving the string or strings used for null values within the data. If the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-string-value" class="externalDFN">string value</a> of the cell is equal to any one of these values, the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-value" class="externalDFN">cell value</a> is <code>null</code>. If not specified, the default for the <code>null</code> property is the empty string. A value for this property is <a>compatible with</a> an inherited value if it is a subset of the inherited value. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-null" class="externalDFN">null</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
+              An <a>atomic property</a> giving the string or strings used for null values within the data. If the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-string-value" class="externalDFN">string value</a> of the cell is equal to any one of these values, the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-value" class="externalDFN">cell value</a> is <code>null</code>. If not specified, the default for the <code>null</code> property is the empty string. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-null" class="externalDFN">null</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
             </p>
           </dd>
           <dt id="cell-ordered"><code>ordered</code></dt>
           <dd>
-            <p>A boolean <a>atomic property</a> taking a single value which indicates whether a list that is the value of the cell is ordered (if <code>true</code>) or unordered (if <code>false</code>). The default is <code>false</code>. This property is irrelevant if the <a href="#cell-separator"><code>separator</code></a> is <code>null</code> or undefined, but this is not an error. A value for this property is <a>compatible with</a> an inherited value only if they are identical. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-ordered" class="externalDFN">ordered</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>, and the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-ordered" class="externalDFN">ordered</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-cell" class="externalDFN">cell</a>.</p>
+            <p>A boolean <a>atomic property</a> taking a single value which indicates whether a list that is the value of the cell is ordered (if <code>true</code>) or unordered (if <code>false</code>). The default is <code>false</code>. This property is irrelevant if the <a href="#cell-separator"><code>separator</code></a> is <code>null</code> or undefined, but this is not an error. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-ordered" class="externalDFN">ordered</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>, and the <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-ordered" class="externalDFN">ordered</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-cell" class="externalDFN">cell</a>.</p>
           </dd>
           <dt id="cell-propertyUrl"><code>propertyUrl</code></dt>
           <dd>
-            <p>An <a>URI template property</a> that MAY be used to create a URI for a property if the table is mapped to another format. There are no <a title="compatible with">compatibility restrictions</a> on this property.  The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-property-url" class="externalDFN">property URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
+            <p>An <a>URI template property</a> that MAY be used to create a URI for a property if the table is mapped to another format. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-property-url" class="externalDFN">property URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
             <p class="note"><code>propertyUrl</code> is typically defined on a <a title="column description">column description</a>. If defined on a <a>schema description</a>, <a>table description</a> or <a>table group description</a>, care must be taken to ensure that transformed cell values maintain an appropriate semantic relationship, for example by including the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-name" class="externalDFN">name</a> of the column in the generated URL by using <code>_name</code> in the template.</p>
           </dd>
           <dt id="cell-required"><code>required</code></dt>
           <dd>
-            <p>A boolean <a>atomic property</a> taking a single value which indicates whether the cell must have a non-null value. The default is <code>false</code>. A value for this property is <a>compatible with</a> an inherited value only if they are identical. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-required" class="externalDFN">required</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
+            <p>A boolean <a>atomic property</a> taking a single value which indicates whether the cell must have a non-null value. The default is <code>false</code>. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-required" class="externalDFN">required</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
           </dd>
           <dt id="cell-separator"><code>separator</code></dt>
           <dd>
             <p>
-              An <a>atomic property</a> that MUST have a single string value that is the character used to separate items in the string value of the cell. If <code>null</code> or unspecified, the cell does not contain a list. Otherwise, application MUST split the string value of the cell on the specified separator character and parse each of the resulting strings separately. The cell's value will then be a list. Conversion specifications MUST use the separator to determine the conversion of a cell into the target format. See <cite><a href="http://w3c.github.io/csvw/syntax/#parsing-cells">Parsing Cells</a></cite> in [[!tabular-data-model]] for more details. A value for this property is <a>compatible with</a> an inherited value only if they are identical. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-separator" class="externalDFN">separator</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
+              An <a>atomic property</a> that MUST have a single string value that is the character used to separate items in the string value of the cell. If <code>null</code> or unspecified, the cell does not contain a list. Otherwise, application MUST split the string value of the cell on the specified separator character and parse each of the resulting strings separately. The cell's value will then be a list. Conversion specifications MUST use the separator to determine the conversion of a cell into the target format. See <cite><a href="http://w3c.github.io/csvw/syntax/#parsing-cells">Parsing Cells</a></cite> in [[!tabular-data-model]] for more details. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-separator" class="externalDFN">separator</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.
             </p>
           </dd>
           <dt id="cell-textDirection"><code>textDirection</code></dt>
           <dd>
             <p>
-              An <a>atomic property</a> that MUST have a single string value that is one of <code>"rtl"</code> or <code>"ltr"</code> (the default). Indicates whether the text within cells should be displayed by default as left-to-right or right-to-left text. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-text-direction" class="externalDFN">text direction</a> annotation for the <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>. A value for this property is <a>compatible with</a> an inherited value only if they are identical. See <cite><a href="http://w3c.github.io/csvw/syntax/index.html#bidirectional-tables">Bidirectional Tables</a></cite> in [[!tabular-data-model]] for details.
+              An <a>atomic property</a> that MUST have a single string value that is one of <code>"rtl"</code> or <code>"ltr"</code> (the default). Indicates whether the text within cells should be displayed by default as left-to-right or right-to-left text. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-text-direction" class="externalDFN">text direction</a> annotation for the <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>. See <cite><a href="http://w3c.github.io/csvw/syntax/index.html#bidirectional-tables">Bidirectional Tables</a></cite> in [[!tabular-data-model]] for details.
             </p>
           </dd>
           <dt id="cell-valueUrl"><code>valueUrl</code></dt>
           <dd>
-            <p>An <a>URI template property</a> that is used to map the values to the cells into URLs. See <cite><a href="http://w3c.github.io/csvw/syntax/#parsing-cells">Parsing Cells</a></cite> in [[!tabular-data-model]] for details. There are no <a title="compatible with">compatibility restrictions</a> on this property.  The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-value-url" class="externalDFN">value URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
+            <p>An <a>URI template property</a> that is used to map the values to the cells into URLs. See <cite><a href="http://w3c.github.io/csvw/syntax/#parsing-cells">Parsing Cells</a></cite> in [[!tabular-data-model]] for details. The value of this property becomes the <a href="http://w3c.github.io/csvw/syntax/#dfn-column-value-url" class="externalDFN">value URL</a> annotation for the described <a href="http://w3c.github.io/csvw/syntax/#dfn-column" class="externalDFN">column</a>.</p>
             <p class="note">
               This allows a <a href="http://w3c.github.io/csvw/syntax/#dfn-cell-value" class="externalDFN">cell value</a> to define one or more RDF <cite><a href="http://www.w3.org/TR/rdf11-concepts/#dfn-resource">resources</a></cite> value of a cell instead of a literal values, as defined in [[rdf-concepts]]. For example, if the value were <code>"{#reference}"</code>, each cell value of a column named <em>reference</em> would be used to create a URI such as <code>http://example.com/#1234</code>, if <code>1234</code> were a cell value of that column.</p>
             <p class="note"><code>valueUrl</code> is typically defined on a <a title="column description">column description</a>. If defined on a <a>schema description</a>, <a>table description</a> or <a>table group description</a>, care must be taken to ensure that transformed cell values maintain an appropriate semantic relationship.</p>