Revamped transformation layout to remove need for the "01_files" level

* "01_files" contained a single "source" transformation which listed the contents of the "00_content" level
** this was unnecessary as the base "list" transformation already lists the contents of all levels
* added new "expression" mode to datasource meta tag processing in the task processing transformation
** this expression modes allows for the evaluation of arbitrary XPath statements
*** e.g. a query to the results of "list.xsl"
* modified base transformation datasource structures to include the level and meta tree
* modified all existing content transformations to query the level-tree instead of the deprecated "source.xml"
** i.e. XPath statements
** the main change is that directories are available as "directory" nodes instead of nodes named by the directory name
* these changes where implemented to simplify the architecture and to increase flexibility

1 files changed, 26 insertions, 0 deletions

diff --git a/source/01_data/tags.xsl b/source/01_data/tags.xsl
new file mode 100644
index 0000000..bfd227b
--- /dev/null
+++ b/source/01_data/tags.xsl
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet
+	version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+>
+
+<xsl:include href="[utility/datasource.xsl]"/>
+
+<xsl:variable name="meta">
+	<datasource type="main"  mode="expression" source="$root/source/directory[1]/directory" target="files"/>
+	<target     mode="plain" value="tags.xml"/> 
+</xsl:variable>
+
+<xsl:template match="files/directory[@name = 'tags']/directory">
+	<entry handle="{@name}">
+		<xsl:apply-templates select="file">
+			<xsl:sort select="@name" order="descending"/>
+		</xsl:apply-templates>
+	</entry>
+</xsl:template>
+
+<xsl:template match="directory[@name = 'tags']/*/file[@extension = '.md']">
+	<article handle="{substring(@name, 12, string-length(@name))}"/>
+</xsl:template>
+
+</xsl:stylesheet>