Shan Sermet

An XML document with correct syntax is called "Well Formed".

An XML document validated against a DTD is both "Well Formed" and "Valid".

DTD stands for Document Type Definition.

A DTD defines the structure and the legal elements and attributes of an XML document.

A "Valid" XML document is "Well Formed", as well as it conforms to the rules of a DTD:

The DOCTYPE declaration above contains a reference to a DTD file. The content of the DTD file is shown and explained below.

The purpose of a DTD is to define the structure and the legal elements and attributes of an XML document:

The DTD above is interpreted like this:

A DOCTYPE declaration can also be used to define special characters or strings, used in the document:

With a DTD, independent groups of people can agree to use a standard DTD for interchanging data.

With a DTD, you can verify that the data you receive from the outside world is valid.

You can also use a DTD to verify your own data.

If you want to study DTD, please read our DTD Tutorial.

XML does not require a DTD.

When you are experimenting with XML, or when you are working with small XML files, creating DTDs may be a waste of time.

If you develop applications, wait until the specification is stable before you add a DTD. Otherwise, your software might stop working because of validation errors.

This is a glimpse into the life of Musk, the billionaire who founded both companies.

One of the most influential platforms in the world is now in charge of the richest man in the world.

June 28, 1971 is the date of birth.

The place of birth is South Africa.

The birth name of the man was Musk.

Errol Musk is the father.

Mother: Maye Musk is a model and a nutritionist.

Marriages: Talulah Riley and Wilson Musk, divorced for the first time.

The children with Justine Musk were: Nevada, died at 10 weeks; the twins, Damian, Saxon and Kai; and the triplets, Damian, Saxon and Kai.

Attended Queen's University in Kingston, Ontario, Canada, 1990-1992, and the University of Pennsylvania, B.S. in economics and B.A. in physics, 1995.

SpaceX is a commercial space exploration company.

The CEO and product architect of the company.

He has owned the social network since October of 2022.

The Musk Foundation supports research in renewable energy, human space exploration, and children's health.

He sold his code for a video game at age 12 to a computer magazine.

The director of the "Iron Man" movies said that Musk helped inspire the screen version of Tony Stark.

Zip2 Corp., a company co-found by Musk, develops online city guides.

Zip2 was sold for US$307 million.

X.com was founded in March 1999 by two people.

In March 2000 X.com and Confinity merged, renamed PayPal.

In June 2002, Musk found a company called SpaceX that was going to lower the cost and increase the accessibility of space travel.

In October 2002, eBay acquired the online payments company, PayPal. Musk has a fortune of $165 million.

In February 2004, Musk joined the board and oversaw the initial round of financing.

In October 2008 he became the CEO and product architect.

The Dragon, a craft developed by the company, hit the water of the Pacific Ocean. The Dragon is the first commercial vehicle to return to Earth.

The first private capsule to connect to the International Space Station is The Dragon.

After delivering more than 1,000 pounds of cargo, including food, clothing, computer equipment and supplies for scientific experiments, the Dragon comes down about 900 kilometers from Baja California.

The flight is a "grand slam" according to Musk. It is the first commercial mission completed by a privately owned vehicle.

Fortune named anentrepreneur of the year.

Plans to help fund a nonprofit artificial intelligence research center were announced on December 11, 2015.

The first time a rocket lands in a drone, it's from the Falcon 9.

The used rocket was launched on March 30, 2017. This is the first time in the history of spaceflight that the same rocket has been used twice.

He stepped down from two of President Donald Trump's business advisory councils after he announced he was pulling the US out of the Paris climate accord. I'm leaving the presidential council.

Climate change is happening. Walking out of Paris is not good for the world.

The Fortune 500 list of the nation's largest companies includes a ranking of 383 on the list of largest companies.

The list shows companies by revenue.

The world's most powerful operational rocket, the Falcon Heavy, was launched on February 6.

A fake astronauts is in the driver's seat of a red car that is being sent into space.

August 7, Musk announced via social media that he is considering taking the company private. The funding is secured according to him.

Two shareholders filed lawsuits accusing Musk and the company of violating federal securities law by making false statements.

The stock price went up immediately after Musk said on August 7 that he was raising funds to take the company private. He lost most of his gains after reports that the Securities and Exchange Commission is investigating Musk's claim.

In a statement posted on the company's website, Musk said he would keep the company public after consulting with the board of directors.

He smokes pot and drinks whiskey during an interview.

Vernon Unsworth, the spelunker who helped rescue 12 boys and their soccer coach from a flooded cave in Thailand in July, filed a defamation lawsuit against Musk in federal court in California. Unsworth will file a lawsuit in London. Musk became angry with Unsworth after the spelunker criticized Musk's attempts to help with the Thai cave rescue effort by building a miniature submarine.

Musk made a false claim that Unsworth was a pedophile. Musk doubled down on his claim before he deleted them.

The Justice Department is looking into whether Musk's comments about taking the company private were illegal.

The SEC is accusing Musk of making false and misleading statements to investors on August 7. The SEC wants Musk to be barred from being an officer or director of a company.

Musk agreed to settle fraud charges with the SEC. Musk will step down as chairman of the company and pay a $20 million fine. The company agrees to pay a $20 million fine, appoint two new independent directors and establish a committee to oversee Musk's communications.

The first tunnel built by the Boring Company was built as an experiment in underground transportation with the aim of providing alternative routes to traffic-choked streets.

The SEC asked a federal judge to hold Musk in contempt of court for violating the terms of the agreement after he said on February 25th that he expected the number of cars produced by the company to go up in 2019. Musk cannot post company information on social media without approval.

The Department of Defense is reviewing Musk's security clearance, according to a report. He applied again after smoking marijuana during a live interview.

Musk reached an agreement with the SEC to resolve the case related to his Musk said he would take the company private for $420. Musk must get approval from an experienced securities attorney before he can talk about some topics on his social media accounts.

Musk revealed a prototype Starship, the rocket and spaceship at the center of his plan to colonize Mars. He says the first passengers could travel to space within a year during his presentation.

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