def new_core_text(db):
    """
    Returns /docProps/core.xml text

    :param pylightxl.Database db: database contains sheetnames, and their data
    :return str: /docProps/core.xml text
    """
    xml_base = (
        '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>\r\n<cp:coreProperties xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cp="http://schemas.openxmlformats.org/package/2006/metadata/core-properties">\r\n<dc:creator>pylightxl</dc:creator>\r\n<cp:lastModifiedBy>pylightxl</cp:lastModifiedBy>\r\n<dcterms:created xsi:type="dcterms:W3CDTF">2019-12-27T01:35:28Z</dcterms:created>\r\n<dcterms:modified xsi:type="dcterms:W3CDTF">2019-12-27T01:35:39Z</dcterms:modified>\r\n</cp:coreProperties>'
        )
    return xml_base
