Property and Property Definition for a Node

Hi all,
While retrieving meta data for each node, I could not understand whether Property for a node represents meta data or Property Definition. Please provide a clear understanding and difference between the two.
Second, is there a predefined fixed set of Property and Property Definition for a node (for any given portal application)?
Provide inputs.
Thanks,
Shakti

Hi Shakti,
A node has two types of metadata -- the built-in system metadata such as node name, node path, node objectClass, create date, modified date, created by, etc -- visible via getXXX methods on the Node object, and the user-defined metadata.
The system metadata applies to all nodes regardless of ObjectClass (and also to nodes without any ObjectClass).
The user-defined metadata depends on the Node's ObjectClass. A node with no objectClass cannot have any user-defined metadata. A node with an objectClass can have the metadata defined by the ObjectClass's Property Definitions.
Suppose Node n has ObjectClass "StringType", and StringType ObjectClass has two property definitions -- StringVal (single-valued string), and BinaryVal (single-valued binary). In this case, Node n can have zero, one, or two user-defined properties from the set 'StirngVal' and 'BinaryVal'.
In short, a PropertyDefinition is a schema, part of the ObjectClass definition, whereas a Property is an instance of a PropertyDefinition attached to a node of the ObjectClass.
-Steve

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