[% 
    # Extract MARC fields from XML
    #   get_marc_attrs( { marc_xml => doc } )
    BLOCK get_marc_attrs;
        xml = args.marc_xml;
        args.isbn = xml.findnodes('//*[@tag="020"]/*[@code="a"]').shift.textContent;
        args.upc = xml.findnodes('//*[@tag="024"]/*[@code="a"]').textContent;
        args.issn = xml.findnodes('//*[@tag="022"]/*[@code="a"]').textContent;
        args.title = xml.findnodes('//*[@tag="245"]/*[@code="a"]').textContent;
        args.author = xml.findnodes('//*[@tag="100"]/*[@code="a"]').textContent;
        args.publisher = xml.findnodes('//*[@tag="260"]/*[@code="b"]').textContent;
        args.pubdate = xml.findnodes('//*[@tag="260"]/*[@code="c"]').textContent;
        args.edition = xml.findnodes('//*[@tag="250"]/*[@code="a"]').textContent ||
            xml.findnodes('//*[@tag="534"]/*[@code="b"]').textContent ||
            xml.findnodes('//*[@tag="775"]/*[@code="b"]').textContent;
        phys = xml.findnodes(
            '//*[@tag="300"]/*[@code="a" or @code="b" or @code="c" or @code="e"]'
        );
        phys_content = [];
        FOR p IN phys; phys_content.push(p.textContent); END;
        args.phys_desc = phys_content.join("");

        # MARC Callnumber
        args.marc_cn = xml.findnodes('//*[@tag="092" or @tag="099"]/*').textContent;

        # clean up the ISBN
        args.isbn_clean = args.isbn.replace('\ .*', '');

        args.holdings = [];
        FOR holding IN xml.findnodes('//*[local-name()="volumes"]/*[local-name()="volume"]');
            args.holdings.push(
                holding.getAttribute('label')
            );
        END;

        # Extract the copy count summary
        count_type = (ctx.is_staff) ? 'staff' : 'public';
        xpath = '//*[local-name()="counts"]/*[local-name()="count"][@type="' _ count_type _ '"]';
        FOR node IN xml.findnodes(xpath);
            args.copy_counts = {};
            FOR attr IN ['count', 'available', 'unshadow', 'transcendant']; 
                args.copy_counts.$attr = node.getAttribute(attr);
            END;
        END;

        # "mattype" == "custom marc format specifier"
        FOR icon_style IN ['mattype', 'item_type']; 
            node = xml.findnodes(
                '//*[local-name()="attributes"]/*[local-name()="field"][@name="' _ icon_style _ '"]');
            IF node;
                args.format_label = node.getAttribute('coded-value')
                args.format_icon = ctx.media_prefix _ '/images/format_icons/' _ icon_style _ '/' _ node.textContent _ '.png';
                LAST;
            END;
        END;
    END;

    BLOCK get_hold_status;
        IF hold.hold.status == 4;
            l("Available");
            IF ahr.shelf_expire_time;
                l('<br/>Expires [_1]', 
                    date.format(ctx.parse_datetime(ahr.shelf_expire_time), DATE_FORMAT));
            END;
        ELSIF hold.hold.estimated_wait AND hold.hold.estimated_wait > 0;
            # estimated wait is delivered as seconds.
            SET hwait = POSIX.ceil(hold.hold.estimated_wait / 86400);
            l("Estimated wait: [quant,_1,day,days]", hwait);
        ELSIF hold.hold.status == 3;
            l("In Transit");
        ELSIF hold.hold.status < 3;
            l("Waiting for copy");
        END;
    END;
%]