[% 
    # Extract MARC fields from XML
    #   get_marc_attrs( { marc_xml => doc } )
    BLOCK get_marc_attrs;
        xml = args.marc_xml;

        # Map item types to schema.org types; impedance mismatch :(
        args.schema.itemtype = {};
        schema_typemap = {};
        schema_typemap.a = 'http://schema.org/Book';
        schema_typemap.j = 'http://schema.org/MusicRecording';

        args.isbns = [];
        FOR isbn IN xml.findnodes('//*[@tag="020"]/*[@code="a"]');
            args.isbns.push(isbn.textContent);
        END;

        args.upcs = [];
        FOR upc IN xml.findnodes('//*[@tag="024"]/*[@code="a"]');
            args.upcs.push(upc.textContent);
        END;
        args.upc = args.upcs.0; # use first UPC as the default

        args.issns = [];
        FOR sub IN xml.findnodes('//*[@tag="022"]/*[@code="a"]');
            args.issns.push(sub.textContent);
        END;
        args.issn = (args.issns.size) ? args.issn.0 : '';

        args.authors = [];
        FOR sub IN xml.findnodes('//*[@tag="100"]/*[@code="a"]');
            args.authors.push(sub.textContent);
        END;
        args.author = (args.authors.size) ? args.authors.0 : '';

        # Include subfields 'abnp' to generate a more comprehensive title display in search results
        titresults = xml.findnodes('//*[@tag="245"]/*[@code="a" or @code="b" or @code="n" or @code="p"]');
        titresults_content = [];
            FOR sub IN titresults; titresults_content.push(sub.textContent); END;
        args.title = titresults_content.join(" ");
        # Avoid ugly trailing syntax on brief titles
        args.title = args.title | replace('[:;/]$', '');

        # Provide correct spacing between the subfields
        titsubs = xml.findnodes('//*[@tag="245"]/*[@code]');
        titsubs_content = [];
            FOR sub IN titsubs; titsubs_content.push(sub.textContent); END;
        args.title_extended = titsubs_content.join(" ");

        args.publishers = [];
        FOR sub IN xml.findnodes('//*[@tag="260"]/*[@code="b"]');
            args.publishers.push(sub.textContent);
        END;
        args.publisher = (args.publishers.size) ? args.publishers.0 : '';

        args.pubdates = [];
        FOR sub IN xml.findnodes('//*[@tag="260"]/*[@code="c"]');
            args.pubdates.push(sub.textContent);
        END;
        args.pubdate = (args.pubdates.size) ? args.pubdates.0 : '';

        args.summaries = [];
        FOR sub IN xml.findnodes('//*[@tag="520"]/*[@code="a"]');
            args.summaries.push(sub.textContent);
        END;
        args.summary = (args.summaries.size) ? args.summaries.0 : '';

        args.editions = [];
        ed_hunt = xml.findnodes('//*[@tag="250"]/*[@code="a"]') ||
            xml.findnodes('//*[@tag="534"]/*[@code="b"]') ||
            xml.findnodes('//*[@tag="775"]/*[@code="b"]');
        FOR sub IN ed_hunt;
            args.editions.push(sub.textContent);
        END;
        args.edition = (args.editions.size) ? args.editions.0 : '';

        phys_content = [];
        FOR sub IN xml.findnodes(
            '//*[@tag="300"]/*[@code="a" or @code="b" or @code="c" or @code="e"]'
        );
            phys_content.push(sub.textContent);
        END;
        args.phys_desc = phys_content.join(" ");

        args.contents_list = [];
        FOR sub IN xml.findnodes('//*[@tag="505"]');
            args.contents_list.push(sub.textContent);
        END;
        args.contents = args.contents_list.join(" ");
        args.content = (args.contents.size) ? args.contents.0 : '';

        # MARC Callnumber
        args.marc_cns = [];
        FOR sub IN xml.findnodes('//*[@tag="092" or @tag="099"]/*');
            args.marc_cns.push(sub.textContent);
        END;
        args.marc_cn = (args.marc_cns.size ) ? args.marc_cns.0 : '';
            

        # clean up the ISBN
        args.isbn_clean = args.isbns.0.replace('\ .*', '');

        # Extract the 856 URLs that are not otherwise represented by asset.uri's
        args.online_res = [];
        FOR node IN xml.findnodes('//*[@tag="856" and @ind1="4" and (@ind2="0" or @ind2="1")]');
            IF node.findnodes('./*[@code="9" or @code="w" or @code="n"]'); NEXT; END; # asset.uri's
            label = node.findnodes('./*[@code="y"]');
            notes = node.findnodes('./*[@code="z" or @code="3"]');
            FOR href IN node.findnodes('./*[@code="u"]');
                NEXT UNLESS href;
                # it's possible for multiple $u's to exist within 1 856 tag.
                # in that case, honor the label/notes data for the first $u, but
                # leave any subsequent $u's as unadorned href's. 
                # use href/link/note keys to be consistent with args.uri's
                args.online_res.push({
                    href => href.textContent, 
                    link => (loop.first AND label) ? label.textContent : href.textContent,
                    note => (loop.first) ? notes.textContent : ''
                });
            END;
        END;
 
        args.holdings = [];
        args.uris = [];
        args.issns = [];
        args.resolver_isbns = [];
        args.resolver_issns = [];

        # we use $9 of ISBN and ISSN as a flag for e-version
        FOR resolver_isbn IN xml.findnodes('//*[@tag="020"]/*[@code="9"]');
            IF resolver_isbn.textContent == "SFX" || resolver_isbn.textContent == "CUFTS";
                my_parent = resolver_isbn.parentNode();
                FOR resolver_isbn_val IN my_parent.findnodes('./*[@code="a"]');
                    args.resolver_isbns.push(
                        resolver_isbn_val.textContent.replace('-', '').replace('\ .*', '')
                    );
                END;
            END;
        END;

        FOR resolver_issn IN xml.findnodes('//*[@tag="022"]/*[@code="9"]');
            IF resolver_issn.textContent == "SFX" || resolver_issn.textContent == "CUFTS";
                my_parent = resolver_issn.parentNode();
                FOR resolver_issn_val IN my_parent.findnodes('./*[@code="a"]');
                    args.resolver_issns.push(
                        resolver_issn_val.textContent.replace('[^\d\-X]', '')
                    );
                END;
            END;
        END;

        # now snag all issns 
        FOR rawissn IN xml.findnodes('//*[@tag="022"]/*[@code="a"]');
            args.issns.push(
                rawissn.textContent.replace('[^\d\-X]', '')
            );
        END;

        FOR volume IN xml.findnodes('//*[local-name()="volumes"]/*[local-name()="volume"]');

            # Check volume visibility - could push this into XPath
            vol.label = volume.getAttribute('label');

            # Prepend prefix, if any
            prefix = volume.findnodes('./*[local-name()="call_number_prefix"][@ident!="-1"]');
            IF prefix.getAttribute('label') != '';
                vol.label = prefix.getAttribute('label') _ " " _ vol.label;
            END;

            # Append prefix, if any
            suffix = volume.findnodes('./*[local-name()="call_number_suffix"][@ident!="-1"]');
            IF suffix.getAttribute('label') != '';
                vol.label = vol.label _ " " _ suffix.getAttribute('label');
            END;

            vol.id = volume.getAttribute('id');
            NEXT IF volume.getAttribute('opac_visible') == 'false';
            NEXT IF volume.getAttribute('deleted') == 'true';

            IF vol.label == '##URI##';
                FOR uri IN volume.findnodes('./*[local-name()="uris"]/*[local-name()="uri"]');
                    res = {};
                    res.href = uri.getAttribute('href');
                    res.link = uri.getAttribute('label');
                    res.note = uri.getAttribute('use_restriction');
                    args.uris.push(res);
                END;
                NEXT;
            ELSE;
                copies = volume.findnodes('./*[local-name()="copies"]/*[local-name()="copy"]');
                FOR copy IN copies;
                    parts = copy.findnodes('./*[local-name()="monograph_parts"]/*[local-name()="monograph_part"]');
                    FOREACH part IN parts;
                        part_label = part.getAttribute('label');
                        LAST IF part_label != '';
                    END;
                    # Check copy visibility
                    cp.deleted = copy.getAttribute('deleted');    
                    cp.visible = copy.getAttribute('opac_visible');
                    NEXT IF (cp.deleted == 'true' OR cp.visible == 'false');

                    # Iterate through all of the children to determine visibility
                    FOR node IN cp.childNodes;
                        NEXT IF cp.visible == 'false';
                        vis = node.getAttribute('opac_visible');
                        del = node.getAttribute('deleted');
                        IF vis == 'false' or del == 'true';
                            cp.visible = 'false';
                        END;
                    END;

                    NEXT IF cp.visible == 'false';
                    
                    loc = copy.findnodes('./*[local-name()="location"]');
                    circlib = copy.findnodes('./*[local-name()="circlib"]');
                    status = copy.findnodes('./*[local-name()="status"]');

                    holding = {
                        label => vol.label,
                        part_label => part_label,
                        location => loc.textContent,
                        library => circlib.textContent,
                        status => status.textContent
                        barcode => copy.getAttribute('barcode')
                    };
                    args.holdings.push(holding);
                    part_label = '';
                END;
            END;
        END;

        # Extract the copy count summary
        count_type = (ctx.is_staff) ? 'staff' : 'public';

        # Consortial copy count summary first
        xpath = '//*[local-name()="counts"]/*[local-name()="count"][@type="' _ count_type _ '"]';
        args.copy_counts = {};
        FOR node IN xml.findnodes(xpath);
            FOR attr IN ['count', 'available', 'unshadow', 'transcendant', 'org_unit']; 
                depth = node.getAttribute('depth');
                args.copy_counts.$depth.$attr = node.getAttribute(attr);
            END;
        END;
        
        # Get preferred library copy count
        args.plib_copy_counts = {};
        count_type = 'pref_lib';
        xpath = '//*[local-name()="counts"]/*[local-name()="count"][@type="' _ count_type _ '"]';
        FOR node IN xml.findnodes(xpath);
            FOR attr IN ['count', 'available', 'unshadow', 'transcendant', 'org_unit']; 
                depth = node.getAttribute('depth');
                args.plib_copy_counts.$depth.$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 AND node.textContent;
                type = node.textContent;
                args.format_label = node.getAttribute('coded-value')
                args.schema.itemtype = schema_typemap.$type;
                args.format_icon = ctx.media_prefix _ '/images/format_icons/' _ icon_style _ '/' _ type _ '.png';
                LAST;
            END;
        END;

    END;
%]