Meta Tags

What's New in Tango Meta Tags

The following are a few of the most important changes and upgrades to existing meta tags, and some of the important new tags.

Scope: All meta tags that have a SCOPE attribute (such as <@ASSIGN>, <@VAR>, and so on) now accept application, as well as all previous scopes and custom scopes, as possible scope values.
For more information, see Chapter 8 of the User's Guide.
<@CGIPARAM>: The COOKIE attribute of <@CGIPARAM> has been removed. You can return the values of cookie variables using the <@VAR> meta tag.
<@SERVERSTATUS>: Many changes have been made to the this meta tag; new categories have been added.
<@USERREFERENCE>: Because of the changes that are needed to support the Load Splitting Client, the value returned by <@USERREFERENCE> (for example, in the system configuration variable userKey) has changed in size. This may affect your Tango application files or database records if you are saving the user reference key.
<@VAR>: The <@VAR> meta tag now uses the ELEMENT attribute with XPointer syntax to point to a single element or a range of elements when the variable referenced by <@VAR> contains a document instance (that is, the internal representation of an XML document). The appropriate XML is returned. For more information, see Chapter 9 of the User's Guide.
<@VARINFO>: The <@VARINFO> meta tag has a new optional attribute, SIZE, that returns the number of bytes used by the variable or array.

There are many new meta tags in Tango 2000. They fall into the following usage categories:

Document Instances: <@DOM>, <@DOMDELETE>, <@DOMINSERT>, <@DOMREPLACE>, <@ELEMENTATTRIBUTE>, <@ELEMENTATTRIBUTES>, <@ELEMENTNAME>, <@ELEMENTVALUE>.
Application Scope: <@APPKEY>, <@APPNAME>, <@APPFILE>.
Objects: <@CALLMETHOD>, <@CREATEOBJECT>, <@ISNULLOBJECT>, <@METAOBJECTHANDLERS>, <@NULLOBJECT>, <@NUMOBJECTS>, <@OBJECTAT>, <@OBJECTS>, <@VARPARAM>.
Tango class files: <@CLASSFILE>, <@CLASSFILEPATH>, <@GETPARAM>, <@SETPARAM>.
Tango Server information: <@CONNECTIONS>, <@DATASOURCESTATUS>.

For information about custom meta tags, see Custom Meta Tags.

Working with custom meta tags: <@CUSTOMTAGS>, <@RELOADCUSTOMTAGS>. The <@RELOADCUSTOMTAGS> meta tag has security built-in; without the correct user password set, this meta tag returns an error.
Working with Tango Web Analyzer: <@VISITORID>.
Working with the cache: <@PURGECACHE>.
Comparison meta tag: <@ISALPHA>.
Creating HTML drop-down lists or radio button groups: <@CHOICELIST>.
Working with Tango domains: <@DOMAIN>.
Binding data source parameters: <@BIND>.
Working with configuration files: <@CONFIGPATH>, <@RELOADCONFIG>. These meta tags have security built-in; without the correct user password set, these meta tags return an error.