Index: Cite.i18n.php
===================================================================
--- Cite.i18n.php	(revision 41903)
+++ Cite.i18n.php	(working copy)
@@ -44,6 +44,8 @@
 	'cite_error_references_no_text'                  => 'Invalid <code>&lt;ref&gt;</code> tag;
 no text was provided for refs named <code>$1</code>',
 	'cite_error_included_ref'                        => 'Closing &lt;/ref&gt; missing for &lt;ref&gt; tag',
+	'cite_error_unvisible_ref'                       => 'Invalid <code>&lt;ref&gt;</code> tag;
+unvisible refs must have name and content',
 
 	/*
 	   Output formatting
@@ -92,6 +94,7 @@
 It is not possible to make a clickable link to this message. "nowiki" is mandatory around [[MediaWiki:Cite references link many format backlink labels]].',
 	'cite_error_references_no_text' => 'Cite extension. This error occurs when the tag <code>&lt;ref name="something" /&gt;</code> is used with the name-option specified and no other tag specifies a cite-text for this name.',
 	'cite_error_included_ref' => 'Error message shown if the <tt>&lt;ref&gt;</tt> tag is unbalanced, that means a <tt>&lt;ref&gt;</tt> is not followed by a <tt>&lt;/ref&gt;</tt>',
+	'cite_error_unvisible_ref' => 'Cite extension. Error message shown if re tag has no name or no content (or both), and visible=no, that means for example <code>&lt;ref visible="no" /&gt;</code> or maybe AAA<code>&lt;ref name="aaa" visible="no"/>',
 );
 
 /** Aragonese (Aragonés)
Index: Cite_body.php
===================================================================
--- Cite_body.php	(revision 41903)
+++ Cite_body.php	(working copy)
@@ -124,11 +124,11 @@
 		}
 	}
 	
-	function guardedRef( $str, $argv, $parser, $default_group=CITE_DEFAULT_GROUP ) {
+	function guardedRef( $str, $argv, $parser, $default_group=CITE_DEFAULT_GROUP, $defaut_visibility=CITE_DEFAULT_VISIBILITY ) {
 		$this->mParser = $parser;
 		
 		# The key here is the "name" attribute.
-		list($key,$group) = $this->refArg( $argv );
+		list($key,$group,$visible) = $this->refArg( $argv );
 		
 		if( $str === '' ) {
 			# <ref ...></ref>.  This construct is  invalid if
@@ -180,18 +180,29 @@
 			$group = $default_group;
 		}
 		
+		# visibility
+		if( $visible === null ) {
+			$visible = $defaut_visibility; 
+		}
+
+		# if there's no key or content, it doesn't make sense not to show the
+		# reference. 
+		if( $visible === 'no' and ( $key === null or $str === null ) ) {
+			return $this->error( 'cite_error_unvisible_ref' );
+		}		  
+		
 		if( is_string( $key ) or is_string( $str ) ) {
 			# We don't care about the content: if the key exists, the ref
 			# is presumptively valid.  Either it stores a new ref, or re-
 			# fers to an existing one.  If it refers to a nonexistent ref,
 			# we'll figure that out later.  Likewise it's definitely valid
 			# if there's any content, regardless of key.
-			return $this->stack( $str, $key, $group );
+			return $this->stack( $str, $key, $group, $visible );
 		}
 
 		# Not clear how we could get here, but something is probably
 		# wrong with the types.  Let's fail fast.
-		$this->croak( 'cite_error_key_str_invalid', serialize( "$str; $key" ) );
+		$this->croak( 'cite_error_key_str_invalid', serialize( "$str; $key; $visible" ) );
 	}
 
 	/**
@@ -208,9 +219,10 @@
 		$cnt = count( $argv );
 		$group = null;
 		$key = null;
+		$visible = null;
 
-		if ( $cnt > 2 )
-			// There should only be one key and one group
+		if ( $cnt > 3 )
+			// There should only be: key, group, visible
 			return false;
 		else if ( $cnt >= 1 ) {
 			if ( isset( $argv['name'] ) ) {
@@ -226,16 +238,22 @@
 				unset( $argv['group']);
 				--$cnt;
 			}
+			if ( isset( $argv['visible'] ) ) {
+				// Visible given.
+				$visible = Sanitizer::escapeId( $argv['visible'] );
+				unset( $argv['visible']);
+				--$cnt;
+			}
 
 			if ( $cnt == 0)
-				return array ($key,$group);
+				return array ($key,$group,$visible);
 			else
 				// Invalid key
-				return array(false,false);
+				return array(false,false,false);
 		}
 		else
 			// No key
-			return array(null,$group);
+			return array(null,$group,$visible);
 	}
 
 	/**
@@ -245,7 +263,7 @@
 	 * @param mixed $key Argument to the <ref> tag as returned by $this->refArg()
 	 * @return string 
 	 */
-	function stack( $str, $key = null, $group ) {
+	function stack( $str, $key = null, $group, $visible ) {
 		if (! isset($this->mRefs[$group])) 
 			$this->mRefs[$group]=array();
 		if (! isset($this->mGroupCnt[$group]))
@@ -268,6 +286,11 @@
 					'number' => ++$this->mGroupCnt[$group]
 				);
 				$this->mInCnt++;
+
+				if( $visible === 'no') {
+					return '<!-- -->';
+				}
+				
 				return
 					$this->linkRef(
 						$group,
@@ -282,6 +305,10 @@
 					// If no text found before, use this text
 					$this->mRefs[$group][$key]['text'] = $str;
 				};
+				if( $visible === 'no') {
+					return '<!-- -->';
+				}
+				
 				return 
 					$this->linkRef(
 						$group,
@@ -289,7 +316,8 @@
 						$this->mRefs[$group][$key]['key']."-".++$this->mRefs[$group][$key]['count'],
 						$this->mRefs[$group][$key]['number'],
 						"-".$this->mRefs[$group][$key]['key']
-					); }
+					); 
+			}
 		}
 
 		else
@@ -356,7 +384,7 @@
 		$ent = array();
 		foreach ( $this->mRefs[$group] as $k => $v )
 			$ent[] = $this->referencesFormatEntry( $k, $v );
-		
+				
 		$prefix = wfMsgForContentNoTrans( 'cite_references_prefix' );
 		$suffix = wfMsgForContentNoTrans( 'cite_references_suffix' );
 		$content = implode( "\n", $ent );
Index: Cite.php
===================================================================
--- Cite.php	(revision 41903)
+++ Cite.php	(working copy)
@@ -39,6 +39,7 @@
 $wgSpecialPageGroups['Cite'] = 'pagetools';
 
 define( 'CITE_DEFAULT_GROUP', '');
+define( 'CITE_DEFAULT_VISIBILITY', 'yes');
 /**
  * The emergency shut-off switch.  Override in local settings to disable
  * groups; or remove all references from this file to enable unconditionally