science

LDAP Data Interchange Format

LDAP Data Interchange Format is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand LDAP Data Interchange Format rather than just read about it. In short: The LDAP Data Interchange Format (LDIF) is a standard plain text data interchange format for representing Lightweight Directory Access Protocol (LDAP) directory content and update requests. LDIF conveys directory content as a set of records, one record for each object (or entry).

Key takeaways

LDAP Data Interchange Format belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LDAP Data Interchange Format to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LDAP Data Interchange Format from memory before moving on to harder problems.

Reference excerpt

The LDAP Data Interchange Format (LDIF) is a standard plain text data interchange format for representing Lightweight Directory Access Protocol (LDAP) directory content and update requests. LDIF conveys directory content as a set of records, one record for each object (or entry). It also represents update requests, such as Add, Modify, Delete, and Rename, as a set of records, one record for each update request. LDIF was designed in the early 1990s by Tim Howes, Mark C. Smith, and Gordon Good while at the University of Michigan. LDIF was updated and extended in the late 1990s for use with Version 3 of LDAP. This later version of LDIF is called version 1 and is formally specified in RFC 2849, an IETF Standard Track RFC. RFC 2849 is authored by Gordon Good and was published in June 2000. It is currently a Proposed Standard. A number of extensions to LDIF have been proposed over the years. One extension has been formally specified by the IETF and published. RFC 4525, authored by Kurt Zeilenga, extended LDIF to support the LDAP Modify-Increment extension. It is expected that additional extensions will be published by the IETF in the future.

Content record format Each content record is represented as a group of attributes, with records separated from one another by blank lines. The individual attributes of a record are represented as single logical lines (represented as one or more multiple physical lines via a line-folding mechanism), comprising "name: value" pairs. Value data that do not fit within a portable subset of ASCII characters are marked with '::' after the attribute name and encoded into ASCII using base64 encoding. Comments can be added beginning the line by a pound-sign ("#", ASCII 35).

Tools that employ LDIF The OpenLDAP utilities include tools for exporting data from LDAP servers to LDIF content records (ldapsearch), importing data from LDIF content records to LDAP servers (ldapadd), and applying LDIF change records to LDAP servers (ldapmodify). LDIF is one of the formats for importing and exporting address book data that the address books in Netscape Communicator and in the Mozilla Application Suite support. Microsoft Windows 2000 Server and Windows Server 2003 include an LDIF based command line tool named LDIFDE for importing and exporting information in Active Directory. JXplorer is a cross platform open source java application that can browse and do basic editing of LDIF files.

LDIF fields dn distinguished name This refers to the name that uniquely identifies an entry in the directory. dc domain component This refers to each component of the domain. For example www.mydomain.com would be written as DC=www,DC=mydomain,DC=com ou organisational unit This refers to the organisational unit (or sometimes the user group) that the user is part of. If the user is part of more than one group, you may specify as such, e.g., OU= Lawyer,OU= Judge. cn common name This refers to the individual object (person's name; meeting room; recipe name; job title; etc.) for whom/which you are querying.

Examples of LDIF This is an example of a simple directory entry with several attributes, represented as a record in LDIF:

This is an example of an LDIF record that modifies multiple single-valued attributes for two different directory entries (this format is used by Microsoft's LDIFDE tool):

Note: the "-" character between each attribute change is required. Also note that each directory entry ends with a "-" followed by a blank line. The final "-" is required by Microsoft's LDIFDE tool, but not needed by most ldif implementations. This is an example of an LDIF file that adds a telephone number to an existing user:

An example of LDIF containing a control:

RFCs RFC 2849 — The LDAP Data Interchange Format (LDIF) - Technical Specification RFC 4510 — Lightweight Directory Access Protocol (LDAP): Technical Specification Road Map RFC 4525 — LDAP Modify-Increment Extension

References

External links MSDN : Windows 2003 : Using the LDIFDE Tool MSDN : Active Directory : LDIF Scripts

Worked examples

Example 1 — a first encounter with LDAP Data Interchange Format

Start with the simplest possible case. Write down what LDAP Data Interchange Format claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to LDAP Data Interchange Format before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about LDAP Data Interchange Format ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of LDAP Data Interchange Format

In research: LDAP Data Interchange Format appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses LDAP Data Interchange Format in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: LDAP Data Interchange Format is common in secondary-school and first-year university syllabi. It links to neighbouring topics Internet Standards, so understanding it makes those chapters shorter.
In everyday life: Look for LDAP Data Interchange Format outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study LDAP Data Interchange Format in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LDAP Data Interchange Format means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain LDAP Data Interchange Format out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LDAP Data Interchange Format in simple terms?

Why does LDAP Data Interchange Format matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study LDAP Data Interchange Format?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on LDAP Data Interchange Format.