tln-query.service.ts
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	import { Injectable, EventEmitter } from '@angular/core';
	import {HttpClient, HttpHeaders} from '@angular/common/http';
	import { Observable } from 'rxjs';
	import { TlnQueryServiceInterface } from './models';
	/**
	* This is the internal query service
	* that communicates with the SPARQL-endpoint.
	* */
	@Injectable()
	export class TlnQueryService implements TlnQueryServiceInterface {
	//baseUrl = 'http://localhost:3030/nietzsche/query';
	baseUrl = 'https://nietzsche.fuseki.services.dasch.swiss/nietzsche'
	reset_data = new EventEmitter<string>();

	constructor(private http: HttpClient) { }

	public resetData(key: string){
	this.reset_data.emit(key);
	}
	/**
	* Gets the data from an endpoint via http post
	*
	* @param query: The query to run.
	* @returns response
	*/
	public getData(query: string): Observable<any> {
	let httpOptions = {
	headers: new HttpHeaders(
	{ 'Content-Type': 'application/sparql-query',
	'Accept': 'application/sparql-results+json; charset=UTF-8'}
	)
	};
	return this.http.post(this.baseUrl, query, httpOptions);
	}

	}