Contains meta data about the page.
For each request an instance of this class will be placed in the pipeline
dictionary under the key "CurrentPageMetaData".
The information stored in CurrentPageMetaData can be referenced in templates
and rendered in an HTML head section:
for example:
<head>
<title>${pdict.CurrentPageMetaData.title}</title>
<meta name="description" content="${pdict.CurrentPageMetaData.description}"/>
.
.
.
</head>
To update the CurrentPageMetaData there is the pipelet UpdatePageMetaData
provided.