Also yesterday the school — formerly known as Jakarta International School — was forced by a new Indonesian government regulation banning the word "International" in school names, to change its name to "Jakarta Intercultural School".

The indictment, which was read to the South Jakarta court on Tuesday, contains five allegations of sodomy against Canadian administrator Neil Bantleman, and a similar number against Indonesian teachers' aide Ferdinant Tjiong, involving three different pre-school aged boys.

But the teachers and the school insist the men are innocent. Their lawyers, Hotman Paris and Patra Zen, indicated outside the court that they will put the motive of one of the mothers at the centre of the defence case.

Mr Hotman said he would present proof in the form of a Blackberry Messenger message and a witness, that the mother offered to drop the case and move overseas "peacefully" in return for a payment of $US13.5 million ($15.96 million).

"There is no doubt about that: they asked for money," Mr Hotman said.

When that claim was refused, the mother increased it to $US125 million ($147.17 million). She also increased the scope of her original complaint — which originally only included six janitors — to encompass the two teachers. She disputes the timing was related to the failed financial claim.

Mr Patra said the alleged victims never mentioned teachers during the original investigation into the school's cleaners.

Mr Hotman also said there was no medical evidence, on either the alleged victims or the perpetrators, of any sexual abuse.

But the indictment said two of the boys, who were tested at the police hospital in June, three months after the complaint was first laid, both had anuses that were "funnel-shaped" and scars.

The indictment was read by prosecutors in closed court which is standard under Indonesian law.

It's alleged that Mr Bantleman raped the boys in a secret room on the second floor of the administration building, and a nearby kitchen. Searches of the school have failed to locate the alleged secret room.

The indictment says Mr Ferdinant's attacks on the same three alleged victims were entirely separate, and happened in toilets on the school campus.

An earlier story about rapes in Bantleman's office — which is glass-walled and transparent — have been dropped since the original allegations were raised.

But other key allegations remain. These include a "magic stone" which Bantleman (variously described as "Boss" or "Skeleton Guy") is said to have inserted into the anus of one of the boys to anaesthetise him, and a light-blue drink allegedly administered by the (female) school principal. She is described in the indictment as a "witness", and an early allegation that she videotaped the rapes has also quietly disappeared from the indictment.

The time period over which many of the rapes are alleged to have occurred now spans "a particular time between January 2013 to March 2014".

The men have been in custody — most recently at the notorious Cipinang prison in Jakarta — since July 14.

Mr Bantleman said outside the court on Tuesday: "I just want the truth to be told". After the hearing, he said of the indictment: "There isn't any evidence; it's all stories".

"The details are so vague that I had to object. They asked me if I understand. How can you understand something so vague? … How can I understand if it doesn't make any sense? … It's just a lot of paper right now with nothing on it."

He said he was being looked after well in prison, and was trying to "be low key". He remained hopeful that "the judicial system will act in accordance with the law and make a decision that's right".

The closed trial involving the five cleaners has become highly controversial in Indonesia as doctors who have examined the young boys deny there is any evidence of sexual molestation, let alone the multiple counts of anal rape that are alleged by the prosecution.

The cleaners originally confessed but later recanted, saying they had been tortured by police. One of them died in police custody during questioning — the police say from suicide.

The cleaners' case is now finished and awaiting judgment in January.

Mr Patra, who also represented the cleaners, says the case against the teachers is "more absurd".

Disclosure: The author has two children at the Jakarta International School