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From conflue...@apache.org
Subject [CONF] Apache Sling Website: Architecture (page edited)
Date Mon, 13 Apr 2009 20:59:00 GMT
<html>
<head>
    <base href="http://cwiki.apache.org/confluence" />
    <style type="text/css">
    <!--
    body, p, td, table, tr, .bodytext, .stepfield {
	font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	color: #000000;
	font-weight: normal;
}
#PageContent {
	text-align: left;
	background-color: #fff;
	padding: 0px;
	margin: 0px;
    padding-bottom:20px;
}
/*
** when this stylesheet is used for the Tiny MCE Wysiwyg editor's edit area, we can't
** use an id=PageContent or class=wiki-content, so we must
** set the body style to that used for PageContent, and p to that used for wiki-content.
*/

body {
	margin: 0px;
	padding: 0px;
	text-align: center;
    background-color: #f0f0f0;
}

@media print {

body {
    background-color: #fff;
}

}

.monospaceInput {
    font:12px monospace
}

.wiki-content p, .commentblock p {
    margin: 16px 0px 16px 0px;
    padding: 0px;
}

.wiki-content-preview {
    padding: 5px;
    border-left: 1px solid #3c78b5;
    border-right: 1px solid #3c78b5;
}

ul, ol {
    margin-top: 2px;
    margin-bottom: 2px;
    padding-top: 0px;
    padding-bottom: 0px;
}

pre {
    padding: 0px;
    margin-top: 5px;
    margin-left: 15px;
    margin-bottom: 5px;
    margin-right: 5px;
    text-align: left;
}

.helpheading {
    font-weight: bold;
    background-color: #D0D9BD;
        border-bottom: 1px solid #3c78b5;
        padding: 4px 4px 4px 4px;
        margin: 0px;
        margin-top: 10px;
}
.helpcontent {
        padding: 4px 4px 20px 4px;
    background-color: #f5f7f1;
}

.code {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.focusedComment {
    background: #ffffce;
}

.commentBox, .focusedComment {
    padding: 10px;
    margin: 5px 0 5px 0;
    border: 1px #bbb solid;
}

.codeHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.codeContent {
    text-align: left;
    background-color: #f0f0f0;
    padding: 3px;
}

.preformatted {
 	border: 1px dashed #3c78b5;
    font-size: 11px;
	font-family: Courier;
    margin: 10px;
	line-height: 13px;
}

.preformattedHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.preformattedContent {
    background-color: #f0f0f0;
    padding: 3px;
}

.panel {
 	border: 1px dashed #3c78b5;
    margin: 10px;
    margin-top: 0px;
}

.panelHeader {
    background-color: #f0f0f0;
 	border-bottom: 1px dashed #3c78b5;
    padding: 3px;
	text-align: center;
}

.panelContent {
    background-color: #f0f0f0;
    padding: 5px;
}

.anonymousAlert {
    background-color: #f0f0f0;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}

.lockAlert {
    background-color: #f0f0f0;
    width: 50%;
 	border: 1px dashed red;
    font-size: 11px;
    padding: 10px 5px 10px 5px;
    margin: 4px;
	line-height: 13px;
}


.code-keyword {
  color: #000091;
  background-color: inherit;
}

.code-object {
  color: #910091;
  background-color: inherit;
}

.code-quote {
  color: #009100;
  background-color: inherit;
}

.code-comment {
  color: #808080;
  background-color: inherit;
}


.code-xml .code-keyword {
  color: inherit;
  font-weight: bold;
}

.code-tag {
  color: #000091;
  background-color: inherit;
}

.breadcrumbs {
    background-color: #f0f0f0;
 	border-color: #3c78b5;
	border-width: 1px 0px 1px 0px;
	border-style: solid;
    font-size: 11px;
    padding: 3px 0px 3px 0px;
}

.navmenu {
    border: 1px solid #ccc;
}

.menuheading {
    font-weight: bold;
    background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 2px 4px;
}

.menuitems {
	padding: 4px 4px 20px 4px;
}

.rightpanel {
    border-left: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

#helpheading {
    text-align: left;
    font-weight: bold;
    background-color: #D0D9BD;
 	border-bottom: 1px solid #3c78b5;
	padding: 4px 4px 4px 4px;
	margin: 0px;
}
#helpcontent {
	padding: 4px 4px 4px 4px;
    background-color: #f5f7f1;
}
.helptab-unselected {
    font-weight: bold;
	padding: 5px;
    background-color: #f5f7f1;
}
.helptab-selected {
    font-weight: bold;
    background-color: #D0D9BD;
	padding: 5px;
}
.helptabs {
    margin: 0px;
    background-color: #f5f7f1;
	padding: 5px;
}
.infopanel-heading {
    font-weight: bold;
	padding: 4px 0px 2px 0px;
}

.pagebody {
}

.pageheader {
	padding: 5px 5px 5px 0px;
 	border-bottom: 1px solid #3c78b5;
}

.pagetitle {
	font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.newpagetitle {
    color: #ccc !important;
}

.steptitle {
	font-size: 18px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
	margin-bottom: 7px;
}

.substeptitle {
    font-size: 12px;
    font-weight: bold;
    font-family: Arial, sans-serif;
    color: #003366;
    margin: 2px 4px 4px 4px;
    padding: 2px 4px 1px 4px;
}

.stepdesc {
    font-family: Verdana, arial, sans-serif;
	font-size: 11px;
	line-height: 16px;
	font-weight: normal;
    color: #666666;
    margin-top: 7px;
    margin-bottom: 7px;
}

.steplabel {
    font-weight: bold;
    margin-right: 4px;
    color: black;
    float: left;
    width: 15%;
    text-align: right;
}

.stepfield {
    background: #f0f0f0;
    padding: 5px;
}

.submitButtons{
    margin-top:5px;
    text-align:right;
}

.formtitle {
	font-size: 12px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: #003366;
}

.sectionbottom {
    border-bottom: 1px solid #3c78b5;
}

.topRow {
    border-top: 2px solid #3c78b5;
}

.tabletitle {
	font-size: 14px;
	font-weight: bold;
	font-family: Arial, sans-serif;
    padding: 3px 0px 2px 0px;
    margin: 8px 4px 2px 0px;
	color: #003366;
	border-bottom: 2px solid #3c78b5;
}
.pagesubheading {
    color: #666666;
    font-size: 10px;
    padding: 0px 0px 5px 0px;
}

HR {
	color: 3c78b5;
	height: 1;
}

A:link, A:visited, A:active, A:hover {
	color: #003366;
}

h1 A:link, h1 A:visited, h1 A:active {
	text-decoration: none;
}

h1 A:hover {
    border-bottom: 1px dotted #003366;
}

.wiki-content > :first-child, .commentblock > :first-child {
    margin-top: 3px;
}

.logocell {
    padding: 10px;
}

input {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #000000;
}

textarea, textarea.editor {
	font-family: verdana, geneva, arial, sans-serif;
	font-size: 11px;
	color: #333333;
}

/* use logoSpaceLink instead.
.spacenametitle {
	font: 21px/31px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle img {
  margin: 0 0 -4px 0;
}
.spacenametitle a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle a:visited {
    text-decoration: none;
    color: #999999;
}*/

.spacenametitle-printable {
	font: 20px/25px Impact, Arial, Helvetica;
    font-weight: 100;
    color: #999999;
	margin: 0px;
}
.spacenametitle-printable a {
    text-decoration: none;
    color: #999999;
}
.spacenametitle-printable a:visited {
    text-decoration: none;
    color: #999999;
}

.blogDate {
	font-weight: bold;
	text-decoration: none;
	color: black;
}

.blogSurtitle {
    background: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.blogHeading {
    font-size: 20px;
    line-height: normal;
    font-weight: bold;
    padding: 0px;
    margin: 0px;
}

.blogHeading a {
   text-decoration: none;
   color: black;
}

.endsection {
	align: right;
	color: #666666;
	margin-top: 10px;
}
.endsectionleftnav {
	align: right;
	color: #666666;
	margin-top: 10px;
}

h1 {
	font-size: 24px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	color: #003366;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 36px 0px 4px 0px;
}

h2 {
	font-size: 18px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
 	border-bottom: 1px solid #3c78b5;
	padding: 2px;
	margin: 27px 0px 4px 0px;
}

h3 {
	font-size: 14px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 21px 0px 4px 0px;
}

h4 {
	font-size: 12px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 18px 0px 4px 0px;
}

h4.search {
	font-size: 12px;
	line-height: normal;
	font-weight: normal;
	background-color: #f0f0f0;
	padding: 4px;
	margin: 18px 0px 4px 0px;
}

h5 {
	font-size: 10px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

h6 {
	font-size: 8px;
	line-height: normal;
	font-weight: bold;
	background-color: #f0f0f0;
	padding: 2px;
	margin: 14px 0px 4px 0px;
}

.smallfont {
    font-size: 10px;
}
.descfont {
    font-size: 10px;
    color: #666666;
}
.smallerfont {
    font-size: 9px;
}
.smalltext {
    color: #666666;
    font-size: 10px;
}
.smalltext a {
    color: #666666;
}
.smalltext-blue {
    color: #3c78b5;
    font-size: 10px;
}
.surtitle {
    margin-left: 1px;
    margin-bottom: 5px;
    font-size: 14px;
    color: #666666;
}

/* css hack found here:  http://www.fo3nix.pwp.blueyonder.co.uk/tutorials/css/hacks/ */
.navItemOver { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #003366; cursor: hand; voice-family: '\'}\''; voice-family:inherit; cursor: pointer;}
.navItemOver a { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItemOver a:visited { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItemOver a:hover { color: #ffffff; background-color:#003366; text-decoration: none; }
.navItem { font-size: 10px; font-weight: bold; color: #ffffff; background-color: #3c78b5; }
.navItem a { color: #ffffff; text-decoration: none; }
.navItem a:hover { color: #ffffff; text-decoration: none; }
.navItem a:visited { color: #ffffff; text-decoration: none; }

div.padded { padding: 4px; }
div.thickPadded { padding: 10px; }
h3.macrolibrariestitle {
    margin: 0px 0px 0px 0px;
}

div.centered { text-align: center; margin: 10px; }
div.centered table {margin: 0px auto; text-align: left; }

.tableview table {
    margin: 0;
}

.tableview th {
    text-align: left;
    color: #003366;
    font-size: 12px;
    padding: 5px 0px 0px 5px;
    border-bottom: 2px solid #3c78b5;
}
.tableview td {
    text-align: left;
    border-color: #ccc;
    border-width: 0px 0px 1px 0px;
    border-style: solid;
    margin: 0;
    padding: 4px 10px 4px 5px;
}

.grid {
    margin: 2px 0px 5px 0px;
    border-collapse: collapse;
}
.grid th  {
    border: 1px solid #ccc;
    padding: 2px 4px 2px 4px;
    background: #f0f0f0;
    text-align: center;
}
.grid td  {
    border: 1px solid #ccc;
    padding: 3px 4px 3px 4px;
}
.gridHover {
	background-color: #f9f9f9;
}

td.infocell {
    background-color: #f0f0f0;
}
.label {
	font-weight: bold;
	color: #003366;
}

label {
	font-weight: bold;
	color: #003366;
}

.error {
	background-color: #fcc;
}

.errorBox {
	background-color: #fcc;
    border: 1px solid #c00;
    padding: 5px;
    margin: 5px;
}

.errorMessage {
	color: #c00;
}

.success {
	background-color: #dfd;
}

.successBox {
	background-color: #dfd;
    border: 1px solid #090;
    padding: 5px;
    margin-top:5px;
    margin-bottom:5px;
}

blockquote {
	padding-left: 10px;
	padding-right: 10px;
	margin-left: 5px;
	margin-right: 0px;
	border-left: 1px solid #3c78b5;
}

table.confluenceTable
{
    margin: 5px;
    border-collapse: collapse;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the border: none attribute from the sectionMacro class */
table.confluenceTable td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

/* Added as a temporary fix for CONF-4223. The table elements appear to be inheriting the border: none attribute from the sectionMacro class */
table.confluenceTable th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

td.confluenceTd
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
}

th.confluenceTh
{
    border-width: 1px;
    border-style: solid;
    border-color: #ccc;
    padding: 3px 4px 3px 4px;
    background-color: #f0f0f0;
    text-align: center;
}

DIV.small {
	font-size: 9px;
}

H1.pagename {
	margin-top: 0px;
}

IMG.inline  {}

.loginform {
    margin: 5px;
    border: 1px solid #ccc;
}

/* The text how the "This is a preview" comment should be shown. */
.previewnote { text-align: center;
                font-size: 11px;
                    color: red; }

/* How the preview content should be shown */
.previewcontent { background: #E0E0E0; }

/* How the system messages should be shown (DisplayMessage.jsp) */
.messagecontent { background: #E0E0E0; }

/* How the "This page has been modified..." -comment should be shown. */
.conflictnote { }

.createlink {
    color: maroon;
}
a.createlink {
    color: maroon;
}
.templateparameter {
    font-size: 9px;
    color: darkblue;
}

.diffadded {
    background: #ddffdd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkgreen;
}
.diffdeleted {
    color: #999;
    background: #ffdddd;
    padding: 1px 1px 1px 4px;
	border-left: 4px solid darkred;
}
.diffnochange {
    padding: 1px 1px 1px 4px;
	border-left: 4px solid lightgrey;
}
.differror {
    background: brown;
}
.diff {
    font-family: lucida console, courier new, fixed-width;
	font-size: 12px;
	line-height: 14px;
}
.diffaddedchars {
    background-color:#99ff99;
    font-weight:bolder;
}
.diffremovedchars {
    background-color:#ff9999;
    text-decoration: line-through;
    font-weight:bolder;
}

.greybackground {
    background: #f0f0f0
}

.greybox {
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.borderedGreyBox {
    border: 1px solid #cccccc;
    background-color: #f0f0f0;
    padding: 10px;
}

.greyboxfilled {
 	border: 1px solid #ddd;
    background: #f0f0f0;
    padding: 3px;
	margin: 1px 1px 10px 1px;
}

.navBackgroundBox {
    padding: 5px 5px 5px 5px;
    font-size: 22px;
	font-weight: bold;
	font-family: Arial, sans-serif;
	color: white;
    background: #3c78b5;
    text-decoration: none;
}

.previewBoxTop {
	background-color: #f0f0f0;
    border-width: 1px 1px 0px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 5px 0px 0px 0px;
    text-align: center;
}
.previewContent {
    background-color: #fff;
 	border-color: #3c78b5;
	border-width: 0px 1px 0px 1px;
	border-style: solid;
	padding: 10px;
	margin: 0px;
}
.previewBoxBottom {
	background-color: #f0f0f0;
    border-width: 0px 1px 1px 1px;
    border-style: solid;
    border-color: #3c78b5;
    padding: 5px;
    margin: 0px 0px 5px 0px;
    text-align: center;
}

.functionbox {
    background-color: #f0f0f0;
 	border: 1px solid #3c78b5;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.functionbox-greyborder {
    background-color: #f0f0f0;
 	border: 1px solid #ddd;
	padding: 3px;
	margin: 1px 1px 10px 1px;
}

.search-highlight {
    background-color: #ffffcc;
}

/* normal (white) background */
.rowNormal {
    background-color: #ffffff;
 }

/* alternate (pale yellow) background */
.rowAlternate {
    background-color: #f7f7f7;
}

/* used in the list attachments table */
.rowAlternateNoBottomColor {
    background-color: #f7f7f7;
}

.rowAlternateNoBottomNoColor {
}

.rowAlternateNoBottomColor td {
    border-bottom: 0px;
}

.rowAlternateNoBottomNoColor td {
    border-bottom: 0px;
}

/* row highlight (grey) background */
.rowHighlight {
    background-color: #f0f0f0;

}

TD.greenbar {FONT-SIZE: 2px; BACKGROUND: #00df00; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.redbar {FONT-SIZE: 2px; BACKGROUND: #df0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }
TD.darkredbar {FONT-SIZE: 2px; BACKGROUND: #af0000; BORDER: 1px solid #9c9c9c; PADDING: 0px; }

TR.testpassed {FONT-SIZE: 2px; BACKGROUND: #ddffdd; PADDING: 0px; }
TR.testfailed {FONT-SIZE: 2px; BACKGROUND: #ffdddd; PADDING: 0px; }

.toolbar  {
    margin: 0px;
    border-collapse: collapse;
}

.toolbar td  {
    border: 1px solid #ccc;
    padding: 2px 2px 2px 2px;
    color: #ccc;
}

td.noformatting {
    border-width: 0px;
    border-style: none;
    text-align: center;
	padding: 0px;
}

.commentblock {
    margin: 12px 0 12px 0;
}

/*
 * Divs displaying the license information, if necessary.
 */
.license-eval, .license-none, .license-nonprofit {
    border-top: 1px solid #bbbbbb;
    text-align: center;
    font-size: 10px;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

.license-eval, .license-none {
    background-color: #ffcccc;
}

.license-eval b, .license-none b {
    color: #990000
}

.license-nonprofit {
    background-color: #ffffff;
}

/*
 * The shadow at the bottom of the page between the main content and the
 * "powered by" section.
 */
.bottomshadow {
    height: 12px;
    background-image: url("$req.contextPath/images/border/border_bottom.gif");
    background-repeat: repeat-x;
}

/*
 * Styling of the operations box
 */
.navmenu .operations li, .navmenu .operations ul {
    list-style: none;
    margin-left: 0;
    padding-left: 0;
}

.navmenu .operations ul {
    margin-bottom: 9px;
}

.navmenu .label {
    font-weight: inherit;
}

/*
 * Styling of ops as a toolbar
 */
.toolbar div {
    display: none;
}

.toolbar .label {
    display: none;
}

.toolbar .operations {
    display: block;
}

.toolbar .operations ul {
    display: inline;
    list-style: none;
    margin-left: 10px;
    padding-left: 0;
}

.toolbar .operations li {
    list-style: none;
    display: inline;
}

/* list page navigational tabs */
#foldertab {
padding: 3px 0px 3px 8px;
margin-left: 0;
border-bottom: 1px solid #3c78b5;
font: bold 11px Verdana, sans-serif;
}

#foldertab li {
list-style: none;
margin: 0;
display: inline;
}

#foldertab li a {
padding: 3px 0.5em;
margin-left: 3px;
border: 1px solid #3c78b5;
border-bottom: none;
background: #3c78b5;
text-decoration: none;
}

#foldertab li a:link { color: #ffffff; }
#foldertab li a:visited { color: #ffffff; }

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border-color: #003366;
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#foldertab li a.current {
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border-bottom: 1px solid white;
color: black;
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.calendarhead:visited {color: white;}
.calendarhead:active {color: white;}
.calendarhead:hover {color: white;}

.blogcalendar th {
    font-size:x-small;
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.blogcalendar td {
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.searchItemSelected { padding: 1px 4px 1px 4px; font-weight: bold; background: #ddd; }

/* permissions page styles */
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/* warning panel */
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/* alert panel */
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/* info panel */
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/* side menu highlighting (e.g. space content screen) */
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{
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font: bold 9px Verdana, sans-serif;
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/* Added by Shaun during i18n */
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/* new form style */
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    </style>
</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/SLINGxSITE">SLINGxSITE</a> :
            <a href="http://cwiki.apache.org/confluence/display/SLINGxSITE/Architecture">Architecture</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/SLINGxSITE/Architecture">Architecture</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~fmeschbe">Felix Meschberger</a>
            <span class="smallfont">(Apr 13, 2009)</span>.
     </p>
    <p>
      Change summary:
      <div class="greybox wiki-content"><p>Rewrite take 1</p></div>
    </p>
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=76156&originalVersion=2&revisedVersion=3">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><h1><a name="Architecture-ArchitectureofSling"></a>Architecture of Sling</h1>

<p>The following is a short list of high-lights of Sling:</p>

<ul>
	<li><b>OSGi</b> &#8212; The Sling application is built as a series of OSGi bundles and makes heavy use of a number of OSGi core and compendium services</li>
	<li><b>Sling API</b> &#8212; To implement Content based Web Applications with Sling, a an API has been defined, which extends the Servlet API and provides more functionality to work on the content</li>
	<li><b>Request Processing</b> &#8212; Sling takes a unique approach to handling requests in that a request URL is first resolved to a resource and only based on the resource then select the actual servlet or script to handle the request.</li>
	<li><b>Resources</b> &#8212; The central mantra of Sling is the <b>Resource</b>, which represents the resource addressed by any request URL. It is the resource, which is first resolved when handling a request. Based on the resource, a first servlet or script is then looked up to actually handle the request.</li>
	<li><b>Servlets and Scripts</b> &#8212; Servlets and Scripts are handled uniformly in that they are represented as resources themselves and are accessible by a resource path.</li>
</ul>


<p>The following sections elaborate on each of these high-lights.</p>

<h2><a name="Architecture-OSGi"></a>OSGi</h2>

<p><span class="nobr"><a href="http://www.osgi.org" title="Visit page outside Confluence" rel="nofollow">OSGi<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> is a consortium which developped a specification to build modular and extensible applications. We are mainly dealing with two parts of the specifications: The Core Specification which defines the OSGi Framework and Core Services and the Compendium Services Specification, which defines a host of Services, which extend the functionality of the OSGi Framework.</p>

<h3><a name="Architecture-OSGiFramework"></a>OSGi Framework</h3>

<p>The OSGi Framework is made up of three layers &#8211; Module, Lifecycle, and Services &#8211; which define how extensible applications are built and deployed. The responsibilities of the layers are:</p>

<ul>
	<li><b>Module</b> &#8212; Defines how a module, or a <em>Bundle</em> in OSGi speak, is defined. Basically a bundle is just a plain old JAR file, whose manifest file has some defined entries. These entries identify the bundle with a symbolic name, a version, and more. In addition there are headers which define what a bundle provides &#8211; <tt>Export-Package</tt> &#8211; and what a bundle requires to be operative &#8211; <tt>Import-Package</tt> and <tt>Require-Bundle</tt>.</li>
	<li><b>Lifecycle</b> &#8212; The lifecycle layer defines the states a bundle may be in and describes the state changes. By providing a class, which implements the <tt>BundleActivator</tt> interface and which is named in the <tt>Bundle-Activator</tt> manifest header, a bundle may hook into the lifecycle process when the bundle is started and stopped.</li>
	<li><b>Services</b> &#8212; For the application to be able to interact, the OSGi Core Specification defines the service layer, which describes a registry for services, which may be shared.</li>
</ul>



<h3><a name="Architecture-CompendiumServices"></a>Compendium Services</h3>

<p>Based on the OSGi Framework specification, the Compendium Services specification defines a (growing) number of extension services, which may be used by applications for various tasks. Of these Compendium Services, Sling is using just a small number:</p>

<ul>
	<li><b>Log Service</b> &#8212; Sling comes with its own implementation of the OSGi Log Service specification. The respective bundle not only provides this implementation, it also exports the SLF4J, Log4J and Commons Logging APIs for Sling application to perform logging.</li>
	<li><b>Http Service</b> &#8212; To hook into a servlet container to provide the Web Application Framework mechanism Sling is leveraging the OSGi Http Service.</li>
	<li><b>Configuration Admin Service</b> &#8212; To simplify configuration of services in Sling, the OSGi Configuraiton Admin service is used. This provides a uniform API to configure services and to build configuration management agents.</li>
	<li><b>Metatype Service</b> &#8212; The OSGi Metatype Service defines a way to describe the data types. Sling uses this service to describe the configurations which may be created using the Configuration Admin Service. These meta type descriptions are used by configuraiton management agents to present to user interface to manage the configurations.</li>
	<li><b>Event Admin Service</b> &#8212; To dispatch events for scheduling of tasks, Sling is using the OSGi EventAdmin service.</li>
	<li><b>Declarative Services</b> &#8212; One of the most important (besides the Log Service) services used by Sling is the Declarative Services Specification. This specification defines how to declaratively create components and services and have the Declaratvie Services runtime actually manage the lifecycle, configuration and references of components.</li>
</ul>



<h2><a name="Architecture-SlingAPI"></a>Sling API</h2>

<p>The Sling API is an extension to the Servlet API which provides more functionality to interact with the Sling framework and also to extend Sling itself and to implement Sling applications.</p>

<p>See the <a href="/confluence/display/SLINGxSITE/Sling+API" title="Sling API">Sling API</a> page for more information.</p>


<h2><a name="Architecture-RequestProcessing"></a>Request Processing</h2>

<p>Traditional Web Application framework emply more or less elaborate methods to select a Servlet or Controller based on the request URL, which in turn tries to load some data (usually from a database) to act upon and finally to render the result somehow.</p>

<p>Sling turns this processing around in that it places the data to act upon at the center and consequently uses the request URL to first resolve the data to process. This data is internally represented as an instance of the <tt>Resource</tt> interface. Based on this resource as well as the request method and more properties of the request URL a script or servlet is then selected to handle the request.</p>

<p>See the <a href="/confluence/display/SLINGxSITE/Request+Processing" title="Request Processing">Request Processing</a> page for more information.</p>


<h2><a name="Architecture-Resources"></a>Resources</h2>


<p>The Resource is one of the central parts of Sling. Extending from JCR's <em>Everything is Content</em>, Sling assumes <em>Everthing is a Resource</em>. Thus Sling is maintaining a virtual tree of resources, which is a merger of the actual contents in the JCR Repository and resources provided by so called resource providers.</p>

<p>Each resource has a path by which it is addressed in the resource tree, a resource type and some resource metadata (such as file size, last modification time). It is important to understand, that a <tt>Resource</tt> instance actually is only a handle to the actual data. By virtue of the <tt>adaptTo(Class&lt;Type&gt;)</tt> method, a resource may be coerced into another data type, which may then be used while processing the request. Examples of data types are <tt>javax.jcr.Node</tt> and <tt>java.io.InputStream</tt>.</p>

<p>See the <a href="/confluence/display/SLINGxSITE/Resources" title="Resources">Resources</a> page for more information.</p>


<h2><a name="Architecture-ServletsandScripts"></a>Servlets and Scripts</h2>

<p>Scripts are usually provides as content in a JCR repository. But since Sling is using a resource tree, a script actually is represented as a Resource and may be provided from within a Bundle (by virtue of the bundle resource provider) or even from the platform file system (by virtue of the file system resource provider).</p>

<p>Accessing scripts in the resource tree, allows for a very easy to understand mapping from resource type to some script path.</p>

<p>Having found the script resource, we still need access to the appropriate script language implementation to evaluate the script. To this avail, Sling is making use of the <tt>Resource.adaptTo(Class&lt;Type&gt;)</tt> method: If a script language implementation is available for the extension of the script name an adaptor for the script resource can be found, which handles the evaluation of the script.</p>

<p>Besides scripting languages, such as ECMAScript, Groovy, JSP, Sling also supports regular servlets. To be able to use servlets for request processing, such servlets must be registered as OSGi services for the <tt>javax.servlet.Servlet</tt> interface and provide a number of service registration properties, which are used to use the servlets. In fact servlets thus registered as OSGi services are mapped into the resource tree by means of a servlet resource provider. This resource provider mapps the servlets into the resource tree using the service registration properties to build one or more resource paths for the servlet.</p>

<p>As a result of mapping servlets into the resource tree and the possibility to adapt resource to an adaptor data type, scripts and servlets may be handled completely transparently: The servlet resolver just looks for a resource matching the resource type and adapts the resource found to <tt>javax.jcr.Servlet</tt>. If the resource happens to be provided by a servlet resource provider, the adapter is of course the servlet itself. If the resource happens to be a script, the adapter is a servlet facade which internally calls the script language implementation to evaluate the script.</p>

<p>See the <a href="/confluence/display/SLINGxSITE/Servlet+Resolution" title="Servlet Resolution">Servlet Resolution</a> page for more information.</p>


<hr />
<p>Old Content Below this Line</p>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b class="strong">Page Status</b><br />
<p>2008-02-01: this page is <b>out of sync</b> with the current codebase, needs to be reviewed and updated.</p></td></tr></table>

<p>Sling is an implementation of the <span class="nobr"><a href="/confluence/pages/createpage.action?spaceKey=SLINGxSITE&amp;title=Component+API&amp;linkCreation=true&amp;fromPageId=76156" title="Create Page: Component API" class="createlink">Component API<sup><img class="rendericon" src="/confluence/images/icons/plus.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> consisting of several modules. The core architectural features of Sling are as follows:</p>

<ul>
	<li>The modules are implemented as OSGi Bundles</li>
	<li>The functionality of Sling is glued together based on the OSGi Service Layer using Declarative Services to easily manage service registrations, configuration and refererence tracking</li>
	<li>Configuration is managed using the OSGi Configuration Admin Service</li>
</ul>



<h2><a name="Architecture-Launching"></a>Launching </h2>

<p>Sling may be launched as a standalone application using the Sling Application or as a Web Application running inside any Servlet API 2.3 or newer Servlet Container.</p>

<p>The Sling Application is a standalone Java Application which is relatively small. It contains some helper classes to launch Apache Felix as the OSGi Framework. Of course the Apache Felix Framework library as well as the OSGi Core and Compendium libraries are part of the Sling Application. These three parts are actually the only ones, which may not be exchanged through the OSGi Lifecycle Layer. To enable bootstrapping, the Sling Application also contains three bundles, which are by default deployed into the started framework: The <tt>log</tt> bundle, the <tt>assembly</tt> bundle and the Apache Felix Bundle Repository bundle. As these bundles are deployed using the OSGi Lifecycle Layer, they may of course be updated if need be.</p>

<p>The Sling Servlet is an extension of the Sling Application in that it contains a simple Servlet calling into the Sling Application Launcher to launch Sling inside the Web Application. Additionally, the Sling Servlet provides the hook for the integration of the OSGi Http Service running inside the framework to attach to the Servlet Container in which the Sling Servlet is running.</p>


<h2><a name="Architecture-ServletContainersupport"></a>Servlet Container support</h2>

<p>As we have seen, Sling may be launched as a standalone Java Application or as a Web Application inside any compliant Servlet Container. To blur the differences of the launching mechanism, Sling internally registers a Servlet with a OSGi <tt>HttpService</tt>. Depending on the launch method, the following <tt>HttpService</tt> implementations are used:</p>


<ul>
	<li><b>Apache Felix <tt>http.jetty</tt></b> - If Sling is launched as a standalone Java Application, the Apache Felix <tt>http.jetty</tt> bundle is used as the implementation of the OSGi <tt>HttpService</tt>. In this case the <tt>http.jetty</tt> bundle exports the Servlet API interfaces used by Sling.</li>
	<li><b>Equinox HTTP Servlet</b> - If Sling is launched as a Web Application, the <span class="nobr"><a href="http://www.eclipse.org/equinox/server" title="Visit page outside Confluence" rel="nofollow">Equinox HTTP Servlet<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> is used as the OSGi <tt>HttpService</tt> implementation to link the HTTP Servlet into the Servlet Container through the Sling Servlet.</li>
</ul>



<h2><a name="Architecture-BootstrappingSling"></a>Bootstrapping Sling</h2>

<p>The Sling launcher (standalone or web application) only contains core classes and bundles to get a first launch. After the launch, the bundle activator of the <em>sling-assembly</em> bundle will look at the framework properties to try to install further bundles and thus bootstrap Sling.</p>

<p>See <a href="/confluence/display/SLINGxSITE/Provisioning+and+Startup" title="Provisioning and Startup">Provisioning and Startup</a> for a detailed description of this process.</p>


<h2><a name="Architecture-BundlesofSling"></a>Bundles of Sling</h2>

<p>Sling consists of the following bundles:</p>

<ul>
	<li><b>sling-log</b> - Implements the OSGi Log Service specification and exports <span class="nobr"><a href="http://www.slf4j.org" title="Visit page outside Confluence" rel="nofollow">SLF4J<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> and <span class="nobr"><a href="http://jakarta.apache.org/commons/logging" title="Visit page outside Confluence" rel="nofollow">Apache Commons Logging<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> for legacy applications. Internally, all logging goes to <span class="nobr"><a href="http://www.logback.org" title="Visit page outside Confluence" rel="nofollow">LOGBack<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>. See also the <a href="/confluence/display/SLINGxSITE/Logging" title="Logging">page on logging</a>.</li>
	<li><b>sling-assembly</b> - Bundle and application installation support. This bundle provides a service to install bundles from an OSGi Bundle Repository. Additionally it supports an application "bundling" functionality called <em>Assembly</em>. See <a href="/confluence/display/SLINGxSITE/Assembly" title="Assembly">Assembly: Bundling Bundles</a> for more details on this bundling.</li>
	<li><b>sling-component-api</b> - Exports the API classes of the <span class="nobr"><a href="/confluence/pages/createpage.action?spaceKey=SLINGxSITE&amp;title=Component+API&amp;linkCreation=true&amp;fromPageId=76156" title="Create Page: Component API" class="createlink">Component API<sup><img class="rendericon" src="/confluence/images/icons/plus.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>.</li>
	<li><b>sling-content-jcr</b> - Implements the JCR Repository Content mapping functionality. Additionally implements support for initial load of content out of bundles into the JCR Repository as well as defining Node Types.</li>
	<li><b>sling-core</b> - The core implementation of the Sling Component Framework. This bundle implements the core request processing infrastructure of Sling. See also the page on <span class="nobr"><a href="/confluence/pages/createpage.action?spaceKey=SLINGxSITE&amp;title=Content+Loading+and+Nodetype+Support&amp;linkCreation=true&amp;fromPageId=76156" title="Create Page: Content Loading and Nodetype Support" class="createlink">Content Loading and Nodetype Support<sup><img class="rendericon" src="/confluence/images/icons/plus.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>.</li>
	<li><b>sling-scripting-core</b> - Basic framework to support scripting languages in Sling.</li>
	<li><b>sling-scripting-jsp</b> - Support for JSP Scripting where the JSP scripts are located in the JCR Repository and will be compiled into classes stored in the JCR Repository. The JSP classes will then be loaded from the JCR Repository using the Jackrabbit Repository Classloader.</li>
	<li><b>sling-scripting-jsp-taglib</b> - Provides a simple basic JSP Tag Library to easily access the Sling internals like the <tt>ContentManager</tt>.</li>
	<li><b>sling-jackrabbit-classloader</b> - Provides the Classloader to load JSP (and other scripting) classes from the JCR Repository. This bundle is used by the <em>sling-scripting-jsp</em> bundle to load the compiled JSP classes.</li>
	<li><b>sling-jasper-sling</b> - Provides the JSP Compiler to the <em>sling-scripting-jsp</em> bundle. As the name implies it is based on the Jasper JSP compiler: Jasper 5.5.20 has been modified to allow writing JSP classes (and intermediate Java sources) to the JSR Repository instead of the platform filesystem. This bundle also contains the Eclipse 3.2 Java Compiler used to compile the Java sources into JSP class files.</li>
	<li><b>sling-jackrabbit-api</b> - Exports the JCR and Jackrabbit API as well as the <tt>jackrabbit-jcr-commons</tt> library. In addition this bundle provides the basis to implement session pooling.</li>
	<li><b>sling-jackrabbit-server</b> - Contains the Jackrabbit core enabling to start Jackrabbit Repository instances embedded in Sling. This bundle uses the <em>sling-jackrabbit-api</em> bundle to provide pooled sessions to the embedded repository instances.</li>
	<li><b>sling-jackrabbit-client</b> - Contains support to access an existing Jackrabbit Repository instance running in the same Java VM (e.g. the Jackrabbit web app) or in a foreign Java VM. Again, this bundle uses the <em>sling-jackrabbit-api</em> bundle to provide pooled sessions to the embedded repository instances.</li>
	<li><b>sling-console-web</b> - Simple Servlet based management GUI to manage a running Sling instance. This tool may be used to manage bundle lifecycle, check the state of the system and manage configurations through the Configuration Admin Service.</li>
	<li><b>sling-component-standard</b> - Standard Components provided by Sling. Currently this bundle contains Content and Component implementations to support simple access nodes of type <tt>nt:folder</tt>, <tt>nt:file</tt> and <tt>nt:resource</tt>.</li>
</ul>
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