[css-counter-styles-3] Define 'negative-capable', define that fixed and cyclic aren't that.

Author: tabatkins

css-counter-styles-3/Overview.html

@@ -381,11 +381,11 @@ <h2 id=counter-styles><span class=secno>2. </span> Counter Styles</h2>
    <li> a <dfn id=name title=counter-name>name</dfn>, to identify the style
 
    <li> an <dfn id=algorithm title=counter-algorithm>algorithm</dfn> that
-    transforms counter values into a string representation
+    transforms counter values into a basic string representation
 
    <li> a <dfn id=negative-sign title=counter-negative>negative sign</dfn>,
     which is prepended or appended to the representation of a negative
-    counter value
+    counter value.
 
    <li> a <dfn id=prefix title=counter-prefix>prefix</dfn>, to prepend to the
     representation
@@ -411,8 +411,8 @@ <h2 id=counter-styles><span class=secno>2. </span> Counter Styles</h2>
    particular counter value, follow these steps:
 
   <ol>
-   <li> If the counter value is outside the <a href="#range"><i
-    title=counter-range>range</i></a> of the counter style, exit this
+   <li> If the counter value is outside the <a
+    href="#descdef-range"><i>range</i></a> of the counter style, exit this
     algorithm and instead <a
     href="#generate-a-counter-representation"><i>generate a counter
     representation</i></a> using the counter style's fallback style and the
@@ -421,17 +421,19 @@ <h2 id=counter-styles><span class=secno>2. </span> Counter Styles</h2>
    <li> Using the counter value and the <a href="#algorithm"><i
     title=counter-algorithm>counter algorithm</i></a> for the counter style,
     generate an initial representation for the counter value. If the counter
-    value is negative, instead generate an initial representation using the
-    absolute value of it.
+    value is negative and the counter style is <a
+    href="#negative-capable"><i>negative-capable</i></a>, instead generate an
+    initial representation using the absolute value of the counter value.
 
    <li> If the representation uses less symbols than specified in the counter
     style's ‘<a href="#descdef-width"><code
     class=property>width</code></a>’ descriptor, prepend symbols to the
     representation as specified in the ‘<a href="#descdef-width"><code
     class=property>width</code></a>’ descriptor.
 
-   <li> If the counter value is negative, wrap the representation in the
-    counter style's <a href="#negative-sign"><i
+   <li> If the counter value is negative and the counter style is <a
+    href="#negative-capable"><i>negative-capable</i></a>, wrap the
+    representation in the counter style's <a href="#negative-sign"><i
     title=counter-negative>negative sign</i></a> as specified in the ‘<a
     href="#descdef-negative"><code class=property>negative</code></a>’
     descriptor.
@@ -1050,6 +1052,23 @@ <h3 id=counter-style-negative><span class=secno>3.2. </span> Formatting
     used in financial contexts, like "(2) (1) 0 1 2 3...".
   </div>
 
+  <p> Not all ‘<a href="#descdef-system"><code
+   class=property>system</code></a>’ values use a negative sign. In
+   particular, a counter style is <dfn
+   id=negative-capable>negative-capable</dfn> is one where its ‘<a
+   href="#descdef-system"><code class=property>system</code></a>’ value is
+   ‘<a href="#symbolic"><code class=css>symbolic</code></a>’, ‘<a
+   href="#speak-as-alphabetic"><code class=css>alphabetic</code></a>’,
+   ‘<a href="#speak-as-numeric"><code class=css>numeric</code></a>’,
+   ‘<a href="#additive"><code class=css>additive</code></a>’, or ‘<a
+   href="#override"><code class=css>override</code></a>’ if the overridden
+   counter style is itself <a
+   href="#negative-capable"><i>negative-capable</i></a>. If a counter style
+   is not <a href="#negative-capable"><i>negative-capable</i></a>, it ignores
+   the negative sign when <a href="#generate-a-counter-representation"><i
+   title="generate a counter representation">generating a counter
+   representation</i></a>.
+
   <h3 id=counter-style-prefix><span class=secno>3.3. </span> Symbols before
    the marker: the ‘<a href="#descdef-prefix"><code
    class=property>prefix</code></a>’ descriptor</h3>
@@ -3954,6 +3973,9 @@ <h2 class=no-num id=index>Index</h2>
    <li>negative, <a href="#descdef-negative"
     title="section 3.2."><strong>3.2.</strong></a>
 
+   <li>negative-capable, <a href="#negative-capable"
+    title="section 3.2."><strong>3.2.</strong></a>
+
    <li>‘<a href="#speak-as-numeric"><code class=css>numeric</code></a>’,
     <a href="#numeric" title="section 3.1.5."><strong>3.1.5.</strong></a>, <a
     href="#speak-as-numeric" title="section 3.9."><strong>3.9.</strong></a>

css-counter-styles-3/Overview.src.html

@@ -111,11 +111,11 @@ <h2 id='counter-styles'>
 
 		<li>
 			an <dfn title='counter-algorithm'>algorithm</dfn> 
-			that transforms counter values into a string representation
+			that transforms counter values into a basic string representation
 
 		<li>
 			a <dfn title='counter-negative'>negative sign</dfn>, 
-			which is prepended or appended to the representation of a negative counter value
+			which is prepended or appended to the representation of a negative counter value.
 
 		<li>
 			a <dfn title='counter-prefix'>prefix</dfn>, 
@@ -146,22 +146,24 @@ <h2 id='counter-styles'>
 
 	<ol>
 		<li>
-			If the counter value is outside the <i title='counter-range'>range</i> of the counter style, 
+			If the counter value is outside the <i>range</i> of the counter style, 
 			exit this algorithm and instead <i>generate a counter representation</i> 
 			using the counter style's fallback style and the same counter value.
 
 		<li>
 			Using the counter value and the <i title='counter-algorithm'>counter algorithm</i> for the counter style, 
 			generate an initial representation for the counter value.
-			If the counter value is negative,
-			instead generate an initial representation using the absolute value of it.
+			If the counter value is negative
+			and the counter style is <i>negative-capable</i>,
+			instead generate an initial representation using the absolute value of the counter value.
 
 		<li>
 			If the representation uses less symbols than specified in the counter style's 'width' descriptor,
 			prepend symbols to the representation as specified in the 'width' descriptor.
 
 		<li>
-			If the counter value is negative,
+			If the counter value is negative
+			and the counter style is <i>negative-capable</i>,
 			wrap the representation in the counter style's <i title='counter-negative'>negative sign</i>
 			as specified in the 'negative' descriptor.
 
@@ -714,6 +716,18 @@ <h3 id='counter-style-negative'>
 		contexts, like "(2) (1) 0 1 2 3...".
 	</div>
 
+	<p>
+		Not all 'system' values use a negative sign.
+		In particular, a counter style is <dfn>negative-capable</dfn>
+		is one where its 'system' value is
+		''symbolic'',
+		''alphabetic'',
+		''numeric'',
+		''additive'',
+		or ''override'' if the overridden counter style is itself <i>negative-capable</i>.
+		If a counter style is not <i>negative-capable</i>,
+		it ignores the negative sign when <i title="generate a counter representation">generating a counter representation</i>.
+
 
 <h3 id='counter-style-prefix'>
 Symbols before the marker: the 'prefix' descriptor</h3>