You need to amplify the question and provide more details. I'll take a stab at it, though. A directory is a table of pointers to files on a data storage media. This can be simplistic tables (the directory is a list of file starting points with names, lengths and attributes and the actual details of the files are in a separate File Allocation Table) or a meta table where the start is like the simple table based version, but the information on the file is scattered accross the file itself (typically, a b-tree structure). The two types of definitions I think you mean are thus File Identifiers, like the file name, and File Allocation, like the FAT or b-tree.
The Active Directory schema defines the kinds of objects, the types of information about those objects, and the default security configuration for those objects that can be stored in Active Directory. The Active Directory schema contains the formal definitions of all objects, such as users, computers, and printers that are stored in Active Directory. On domain controllers running either Windows 2000 or Windows Server 2003, there is only one schema for an entire forest. This way, all objects that are created in Active Directory conform to the same rules. The schema has two types of definitions: object classes and attributes. Object classes such as user, computer, and printer describe the possible directory objects that you can create. Each object class is a collection of attributes. Attributes are defined separately from object classes. Each attribute is defined only once and can be used in multiple object classes. For example, the Description attribute is used in many object classes, but is defined only once in the schema to ensure consistency.
The Star & Snowflake are two common type of database Schema.
There is need for mappings between schema levels for visualization and schema matching. The mappings between schema levels helps in the different types of transformation.
A data dictionary is a document that describes database objects such as tables, columns, and their corresponding data types. It provides information about the structure, relationships, and constraints of the database schema.
schema attributes
Network+ Schema - the description of object types, or classes, and their required and optional attributes that are stored in an NOSs directory A schema is a conception perceived across all the members of a class.
'Active' and 'dormant' .
Different types of definitions include stipulative, descriptive, explicative, real, and nominal.
The schema contains all the information how the objects need to be created, what type of objects can be created in the forest what are its attributes, functions, its class files etc .if we have the shred schema in the network all the objects in the forest and domain will be same types so it will be easy to manage,administer, apply security in the network
XML schema is used to define the structure, content, and data types within an XML document. It helps enforce rules for validating data in XML files, ensuring that they conform to a specific format. By using XML schema, developers can establish standards for data exchange and communication between different systems.
The Active Directory Schema defines the types of user,printer objects to be created in the domain
describe and tell the four types of tourist?