@Test
public void isStringIdentifier() {

	assertTrue(XMLResources.isStringIdentifier(XMLResources.IDENTIFIER_PREFIX + "0")); //$NON-NLS-1$
	assertTrue(XMLResources.isStringIdentifier(XMLResources.IDENTIFIER_PREFIX + "351")); //$NON-NLS-1$
	assertTrue(XMLResources.isStringIdentifier(XMLResources.IDENTIFIER_PREFIX + "-4521")); //$NON-NLS-1$
	assertFalse(XMLResources.isStringIdentifier(null));
	assertFalse(XMLResources.isStringIdentifier("")); //$NON-NLS-1$
	assertFalse(XMLResources.isStringIdentifier("-4521")); //$NON-NLS-1$
	assertFalse(XMLResources.isStringIdentifier(XMLResources.IDENTIFIER_PREFIX));
}