query.service.ts
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	import { Injectable } from '@angular/core';
	import { DataService } from './resources.service';

	@Injectable()

	export class QueryService {
	query: string;
	select = 'SELECT ?p ?o '
	whereSubject: string;
	whereObject: string;
	wherePredicate: string;
	Optional = '';
	queryLimit = ' LIMIT 200';

	constructor(private dataService: DataService ) {
	}

	public assemble_resource_data(resourceValue: string, resourceOwlClass?: string) {
	switch (resourceOwlClass) {
	case 'subject': {
	this.whereSubject = ' <' + decodeURI(resourceValue) + '> ';
	this.wherePredicate = ' ?p ';
	this.whereObject = ' ?o ';
	break;
	}
	case 'object': {
	this.whereObject = ' <' + decodeURI(resourceValue) + '> ';
	this.wherePredicate = ' ?p ';
	this.whereSubject = ' ?s ';
	break;
	}
	case 'predicate': {
	this.wherePredicate = ' <' + decodeURI(resourceValue) + '> ';
	this.whereObject = ' ?o ';
	this.whereSubject = ' ?s ';
	break;
	}
	}

	this.query = this.select + 'WHERE { ' + this.whereSubject + this.wherePredicate + this.whereObject + this.Optional + ' } ' + this.queryLimit;

	return this.query;
	}
	}