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Information types and topics
Topics are the building blocks of modular documents, and organising topics by semantic information types is one of the architectural features of DITA.
Topic exemplars
Configuring source addresses
The IP address (or range of IP addresses) to which a security policy applies is set on the Source Address tab of the Configuration window.

Introduction
Information types and topics
Topics are the building blocks of modular documents, and organising topics by semantic information types is one of the architectural features of DITA.
- Content models and information types
  A content model is a framework that represents the structure of the information to be stored. In DITA, a content model is implemented as an information type, or topic type.
- Information types
  A fundamental principle of DITA is information typing, which categorises information according to the nature of the content. The three base DITA information types are concept, task and reference.
- What is a topic?
  A topic in DITA is an independent chunk of information covering a single idea or task, authored as a unit, and stored in its own file. Topics are categorised by information type. DITA's topic-based architecture enables the same topic to be used in different publications.
- Working with topics
- Specialised information types
  Specialised information types provide a topic architecture that closely matches the structure of your content.
- Topic exemplars
  - Configuring source addresses
    The IP address (or range of IP addresses) to which a security policy applies is set on the Source Address tab of the Configuration window.
  - Setting the local directory
    When the FTP connection is established, the local files list will automatically display the contents of the local directory specified on the Advanced tab.
DITA map files
Syntax and mark-up
Language and punctuation
Graphics and figures
Cross-referencing
Cross-references are a means of binding individual topics into a coherent and navigable document.
Content re-use
Metadata, conditional processing, and indexing
The DITA documentation process
DITA authoring concepts
Moving from style-based authoring to a structured authoring methodology such as DITA requires a radically different approach to writing.

Configuring source addresses

The IP address (or range of IP addresses) to which a security policy applies is set on the Source Address tab of the Configuration window.

You must have been allocated a static IP address before configuring the address.

Prerequisites: Applying for Static IP Address Allocation

Use the Source Address tab to specify the source IP address for a security policy.

Click the Source Address tab.

Select one of the following settings:

Option	Description
Any	Applies the rule to any IP address.
Single IP Address	Applies the rule to one IP address. Note: Use the dotted decimal format. Example: 127.0.0.1
Network Address	Applies the rule to a block of IP addresses. Value: The entry after the slash is the prefix length, and is a number from 1 to 32. Example:
Address Name	Applies the rule to an address name created as a network object. Tip: If you use network objects in a policy, it is easier to define the policy if you pre-define those objects in Configuration > Objects before you use them.
Dynamic Address Name	Applies the rule to a dynamic address name created as a network object.

Click OK.