Extracted meta symbol generation

* src/current/include/preproc/symtable.xsl
  (preproc:symtable)[lv:meta]: Extracted template.

* src/symtable/symbols.xsl
  (preproc:symtable)[lv:meta]: Added template.

* test/symtable/symbols.xsl
  (lv:meta): Scenario added

src/current/include/preproc/symtable.xsl

@@ -901,14 +901,6 @@
 </xsl:template>
 
 
-<xsl:template match="lv:meta" mode="preproc:symtable" priority="5">
-  <xsl:for-each select="lv:prop">
-    <preproc:sym name=":meta:{@name}" type="meta"
-                 keep="true" />
-  </xsl:for-each>
-</xsl:template>
-
-
 <xsl:template match="preproc:sym[ @type='param' ]" mode="preproc:symtable-complete" priority="5">
   <xsl:param name="syms" as="element( preproc:sym )*" />
 

src/symtable/symbols.xsl

@@ -250,6 +250,7 @@
 
   @menu
   * Templates: Template Symbols.                @code{tpl}
+  * Program Metadata: Program Metadata Symbols. @code{meta}
   @end menu
 -->
 
@@ -291,4 +292,45 @@
 </template>
 
 
+<!--
+  @node Program Metadata Symbols
+  @subsection Program Metadata Symbols
+
+  A basic key-value system allows for compiling static metadata into
+    the program.
+  These metadata can be referenced externally without having to run
+    the program.
+-->
+
+<!--
+  Produce a @code{meta} symbol for each @pkgns{meta/}@pkgns{prop} with
+    the following attributes:
+
+  @table @code
+  @item name
+  The metavalue name as provided by @pkgns{prop/@@name},
+    prefixed with @samp{:meta:} to avoid conflicts with other
+    symbols.
+
+  @item desc
+  Generic description including @code{name}.
+
+  @item keep
+  Always @samp{true}.
+  @end table
+
+  The @code{name} prefix enforces separation between the two
+    compilation stages by preventing conflicts.
+-->
+<template mode="preproc:symtable" priority="5"
+          match="lv:meta">
+  <for-each select="lv:prop">
+    <preproc:sym type="meta"
+                 name=":meta:{@name}"
+                 desc="Metavalue {@name}"
+                 keep="true" />
+  </for-each>
+</template>
+
+
 </stylesheet>

test/symtable/symbols.xspec

@@ -44,4 +44,30 @@
                    desc="Test template" />
     </expect>
   </scenario>
+
+
+  <scenario label="lv:meta">
+    <context mode="preproc:symtable">
+      <lv:meta>
+        <lv:prop name="prop1">
+          <lv:const value="ignore" />
+        </lv:prop>
+
+        <lv:prop name="prop2">
+          <lv:const value="ignore" />
+        </lv:prop>
+      </lv:meta>
+    </context>
+
+    <expect label="derives symbols from properties">
+      <preproc:sym type="meta"
+                   name=":meta:prop1"
+                   desc="Metavalue prop1"
+                   keep="true" />
+      <preproc:sym type="meta"
+                   name=":meta:prop2"
+                   desc="Metavalue prop2"
+                   keep="true" />
+    </expect>
+  </scenario>
 </description>