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+# uriAnchor 
+## a jquery plugin for management of the uri hash component
+
+Michael S. Mikowski - Posted 2013-01-12
+
+## method: setAnchor
+
+### Purpose
+
+Sets Anchor component of the URI from a Map
+(The Anchor component is also known as the
+'hash fragment' or 'bookmark component')
+
+### Arguments
+
+Arguments are positional:
+
+* 1 ( anchor_map )   The map to be encoded to the URI anchor
+* 2 ( option_map )   : map of options
+* 3 ( replace_flag )  : boolean flag to replace the URI When true, the URI is replaced, which means the prior URI is not entered into the browser history
+
+### Environment
+
+Expects the document.location browser object
+
+### Settings
+
+none
+
+### Settings
+
+none
+
+### Returns
+
+boolean: true on success, false on failure
+
+### Throws
+
+none
+
+### Details
+
+The first positional argument, anchor_map, may be a simple map:
+
+    $.uriAnchor.setAnchor({
+      page   : 'profile',
+      slider : 'confirm',
+      color  : 'red'
+    });
+
+This changes the URI anchor to:
+
+    #!page=profile&slider=confirm&color=red
+
+All these arguments are independent, that is, they can vary
+independent of each other. We also support dependent values -
+values that depend on others.
+
+An independent argument key has no '_' prefix.  The same key name,
+prefixed by an '_', holds the arguments that are dependent on
+an independent argument.  The dependent key always points
+to a map.  Consider:
+
+    $.uriAnchor.setAnchor({
+      page   : 'profile',
+      _page  : {
+        uname   : 'wendy',
+        online  : 'today'
+      }
+    });
+
+This changes the URI Anchor to:
+
+    #!page=profile:uname,wendy|online,today
+
+Only independent keys and their matching dependent keys are
+processed.  All other keys are ignored.  Importantly, this includes
+keys of the form _s_/key/ ( e.g. '_s_page' ) returned by makeAnchorMap
+
+Setting a more complex anchor map is illustrated below:
+
+    $.uriAnchor.setAnchor({
+      page : 'profile',
+      _page : {
+        uname   : 'wendy',
+        online  : 'today'
+      },
+      slider  : 'confirm',
+      _slider : {
+       text   : 'hello',
+       pretty : false
+      },
+      color : 'red'
+    });
+
+This sets the URI Anchor to:
+
+     #!page=profile:uname,wendy|online,today&slider=confirm:text,hello\
+       |pretty,false&color=red
+
+Options: The second positional argument tp this method, option_map,
+provides a number of options for delimiters:
+
+* delimit_char     : delimiter independent args
+  Defaults to '&'
+* delimit_kv_char  : delimiter key-value of independent args
+  Defaults to '='
+* sub_delimit_char : delimiter independent and dependent args
+  Defaults to ':'
+* dep_delimit_char : delimiter between key-value of dependent args
+  Defaults to '|'
+* dep_kv_delimit_char : key-value delimiter for dependent args.
+  Defaults to ','
+
+Boolean values ( as part of a key-value pair ) are convert into the stings 'true' or 'false'.
+
+Validation:
+
+As of 1.0, the ability to optionally check the validity of the
+Anchor against a schema has been included.  Since we don't expect
+the allowable schema to change during run-time, we use a
+module configuration to set the schema, like so:
+
+  $uriAnchor.configModule({
+    schema_map : {
+      page    : { profile : true, pdf : true },
+      _page   : {
+        uname   : true,
+        online  : { 'today','yesterday','earlier' }
+      },
+      slider  : { confirm : 'deny' },
+      _slider : { text : 'goodbye' },
+      color   : { red : true, green : true, blue : true }
+    }
+  });
+
+This check occurs only during setting of the Anchor, not
+during its parsing ( See makeAnchorMap )
+
+The replace_flag instructs the routine to replace the uri,
+discarding browser history
+
+
+## method: makeAnchorMap
+
+### Purpose
+
+ Parses URI anchor and returns as map
+
+### Arguments
+
+ none
+
+### Environment
+
+ Expects the document.location browser object
+
+### Settings
+
+ none
+
+### Returns
+
+ Map
+
+### Throws
+
+ none
+
+
+### Details
+
+Parses the browser URI anchor into a map using the same
+rules used to set the anchor in the method setAnchor
+( see above ).
+
+This method creates an additional key type, _s_<indendent_arg>
+for each independent argument with dependent arguments.
+
+These keys point to a string representation of the independent
+argument along with all its dependent arguments.
+
+These values are ignored by setAnchor, but they are useful
+for routines using setAnchor to check if a part of the anchor
+has changed.
+
+### Example
+If the browser URI Anchor looks like this:
+
+    #!page=profile:uname,wendy|online,true&slider=confirm:text,hello\
+    |pretty,false&color=red
+
+Then calling $.uriAnchor.makeAnchorMap(); will return a map that looks like so:
+
+    { page : 'profile',
+      _page : {
+        uname   : 'wendy',
+        online  : 'today'
+      },
+      _s_page : 'profile:uname,wendy|online,today',
+      slider  : 'confirm',
+      _slider : {
+       text   : 'hello',
+       pretty : false
+      },
+      _s_slider : 'confirm:text,hello|pretty,false',
+      color : 'red'
+    };
+