Mashups in EMML : Writing Mashups in EMML : Adding Metadata to Mashups
Adding Metadata to Mashups
 
<emml-meta>
<presto:macro-meta>
<presto:presto-meta>
<user-meta>
Metadata declarations allow you to set processing flags or pass other information to applications that will use a mashup, use a macro or handle mashup results. Metadata is stored with mashups in the Presto Repository and can be queried Using the Built-in Mashup Query Web Service.
The metadata declarations that you can use include:
*<emml-meta> for metadata built into EMML. It provides processing flags or other information used by the Presto Server.
*<presto:macro-meta> for metadata for macros that is used by Presto. It provides processing flags used by the Presto Server or by mashup composers such as Wires.
Note:  
<presto:macro-meta> is a new metadata element that replaces variations of the <presto:presto-meta> element specific to macros.
*<presto:presto-meta> for metadata for mashups that is used by Presto. It provides processing flags used by the Presto Server or by mashup composers such as Wires.
Note:  
Variations of <presto:presto-meta> specific to macros have been deprecated. Use <presto:macro-meta> instead.
*<user-meta> to define your own custom metadata. You can use this for flags or any other data you wish to associate with a mashup or a macro. You define the names and content of user metadata to fit your requirements.
Metadata Names and Values
Most metadata declarations have a name attribute that identifies the purpose of the metadata. Names for user-defined metadata must:
*Be unique.
*Start with an ASCII letter and contain only ASCII letters, numbers, dashes (-) or underscores (_). Names are case sensitive.
Metadata declarations can contain a simple value or a complex structure of descendant elements. Simple values for metadata are a string datatype.
For complex structures, descendants can only be your own custom metadata or extensions specifically allowed in <presto:presto-meta> or <presto:macro-meta>. Other EMML statements or declarations are not allowed.
For example:
<user-meta name="refresh-seconds">5</user-meta>
<presto:presto-meta name="created-using">Wires</presto:presto-meta>
<presto:macro-meta>
<block usage="Wires">
<help>Returns all open issues for the customer specified as input.</help>
<icon usage="menu" url="http://myOrg.com/icons/myBlockSmall.png"/>
<icon usage="canvas" url="http://myOrg.com/icons/myBlockMed.png"/>
</block>
<parameters>
<parameter name="query">
<label>Customer</label>
<help>Enter part or all of a customer name to find open issues.</help>
<type datatype="text"/>
</parameter>
</parameters>
</presto:macro-meta>
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