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import { fetchApi } from "@/lib/api";
import { Suspense, useEffect, useState } from "react";
import { useSearchParams } from "next/navigation";
import {
Database,
Network,
Loader2,
Edit3,
Download,
GitBranch,
X,
Bookmark,
ShieldCheck,
Users,
RotateCcw,
ExternalLink,
} from "lucide-react";
import Link from "next/link";
import MermaidDiagram from "@/components/MermaidDiagram";
interface Dataset {
id: string;
title: string;
description: string;
license: string;
conformsTo: string;
publisher: string;
theme: string;
datasetType: string;
legalBasis: string;
recordCount: number;
providers?: string[];
consumers?: string[];
fhirResources?: string[];
transfers?: string[];
}
const LEGAL_BASIS_LABELS: Record<string, string> = {
"EHDS-Art53-SecondaryUse": "EHDS Art. 53",
};
/** Theme → Tailwind gradient classes */
const THEME_GRADIENT: Record<string, string> = {
Oncology: "from-blue-600 to-indigo-700",
"Cancer Registry": "from-blue-600 to-indigo-700",
"Clinical Research": "from-violet-600 to-purple-700",
Epidemiology: "from-violet-600 to-purple-700",
"Clinical Trials": "from-violet-600 to-purple-700",
"Patient Journey": "from-teal-600 to-emerald-700",
"Patient Summary": "from-teal-600 to-emerald-700",
"Encounter Records": "from-teal-500 to-cyan-700",
Diagnostics: "from-purple-600 to-fuchsia-700",
"Laboratory Results": "from-purple-500 to-fuchsia-600",
Medications: "from-amber-600 to-orange-700",
Pharmacovigilance: "from-amber-500 to-red-700",
Procedures: "from-orange-500 to-amber-600",
"Care Plans": "from-green-600 to-teal-700",
Immunisation: "from-green-500 to-emerald-700",
Allergies: "from-rose-600 to-red-700",
"Problem List": "from-rose-600 to-red-700",
"Catalog Metadata": "from-slate-600 to-gray-700",
"Regulatory Data": "from-amber-600 to-red-600",
};
function themeGradient(theme: string): string {
return THEME_GRADIENT[theme] ?? "from-blue-600 to-indigo-700";
}
/** Provider status badge config */
function providerStatus(publisher: string): {
label: string;
dotColor: string;
textColor: string;
} {
const lower = publisher?.toLowerCase() ?? "";
if (lower.includes("alphaklini") || lower.includes("limburg")) {
return {
label: "VERIFIED PROVIDER",
dotColor: "bg-[var(--role-user-text)]",
textColor: "text-[var(--role-user-text)]",
};
}
Iif (lower.includes("medreg") || lower.includes("institut")) {
return {
label: "HDAB AUTHORITY",
dotColor: "bg-[var(--role-hdab-text)]",
textColor: "text-[var(--role-hdab-text)]",
};
}
return {
label: "PARTNER NETWORK",
dotColor: "bg-[var(--warning-text)]",
textColor: "text-[var(--warning-text)]",
};
}
/** Short publisher name */
function shortPublisher(publisher: string): string {
if (!publisher) return "—";
return publisher
.replace(/\(.*?\)/g, "")
.trim()
.split(" ")
.slice(0, 2)
.join(" ");
}
/** Friendly datasetType label */
function dataTypeLabel(dt: string): string {
const map: Record<string, string> = {
SyntheticData: "Synthetic",
AnalyticsData: "Analytics",
RegistryData: "Registry",
RealWorldData: "Real-World",
AggregatedData: "Aggregate",
MetadataCatalog: "Metadata",
RegulatoryData: "Regulatory",
};
return map[dt] ?? dt;
}
function buildDcatApDiagram(d: Dataset): string {
const lines = [
"erDiagram",
` HealthDataset {`,
` string id "${d.id}"`,
` string title "${d.title}"`,
` string publisher "${d.publisher || "—"}"`,
` string theme "${d.theme || "—"}"`,
` string license "${d.license || "—"}"`,
` string legalBasis "${d.legalBasis || "—"}"`,
` string conformsTo "${d.conformsTo || "—"}"`,
` string datasetType "${d.datasetType || "—"}"`,
` int recordCount "${d.recordCount ?? "—"}"`,
` }`,
];
Eif (d.publisher) {
lines.push(
` Publisher {`,
` string name "${d.publisher}"`,
` }`,
);
lines.push(` Publisher ||--o{ HealthDataset : "publishes"`);
}
Eif (d.conformsTo?.includes("fhir")) {
lines.push(
` FHIRProfile {`,
` string version "R4"`,
` string spec "${d.conformsTo}"`,
` }`,
);
lines.push(` HealthDataset ||--|| FHIRProfile : "conformsTo"`);
}
Eif (d.legalBasis) {
lines.push(
` LegalBasis {`,
` string article "${d.legalBasis}"`,
` }`,
);
lines.push(` HealthDataset ||--|| LegalBasis : "legalBasisForAccess"`);
}
Eif (d.theme) {
lines.push(` Theme {`, ` string label "${d.theme}"`, ` }`);
lines.push(` HealthDataset }o--|| Theme : "theme"`);
}
lines.push(
` Catalog {`,
` string standard "HealthDCAT-AP"`,
` }`,
);
lines.push(` Catalog ||--o{ HealthDataset : "dcatDataset"`);
return lines.join("\n");
}
function buildDcatApJsonLd(d: Dataset): object {
return {
"@context": {
dcat: "http://www.w3.org/ns/dcat#",
dct: "http://purl.org/dc/terms/",
healthdcatap: "https://healthdcat-ap.github.io/ns#",
foaf: "http://xmlns.com/foaf/0.1/",
},
"@type": "dcat:Dataset",
"@id": d.id,
"dct:title": d.title,
"dct:description": d.description,
"dct:license": d.license,
"dct:conformsTo": d.conformsTo,
"dct:publisher": d.publisher
? { "@type": "foaf:Organization", "foaf:name": d.publisher }
: undefined,
"dcat:theme": d.theme,
"healthdcatap:datasetType": d.datasetType,
"healthdcatap:legalBasisForAccess": d.legalBasis,
"healthdcatap:numberOfRecords": d.recordCount,
};
}
export default function CatalogPage() {
return (
<Suspense
fallback={
<div className="flex items-center gap-2 text-[var(--text-secondary)] p-10">
<Loader2 size={16} className="animate-spin" />
Loading…
</div>
}
>
<CatalogContent />
</Suspense>
);
}
function CatalogContent() {
const [datasets, setDatasets] = useState<Dataset[]>([]);
const [loading, setLoading] = useState(true);
const searchParams = useSearchParams();
const [searchText, setSearchText] = useState(
searchParams.get("search") ?? "",
);
const [selectedThemes, setSelectedThemes] = useState<string[]>([]);
const [selectedTypes, setSelectedTypes] = useState<string[]>([]);
const [minSamples, setMinSamples] = useState(0);
const [detailDataset, setDetailDataset] = useState<Dataset | null>(null);
const [diagramDataset, setDiagramDataset] = useState<Dataset | null>(null);
const downloadDcatAp = (d: Dataset) => {
const jsonLd = buildDcatApJsonLd(d);
const blob = new Blob([JSON.stringify(jsonLd, null, 2)], {
type: "application/ld+json",
});
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.href = url;
a.download = `${d.id.replace(/[^a-z0-9-]/gi, "_")}.jsonld`;
a.click();
URL.revokeObjectURL(url);
};
useEffect(() => {
fetchApi("/api/catalog")
.then((r) => r.json())
.then((d) => {
const arr = Array.isArray(d) ? d : d.datasets || d.catalog || [];
if (arr.length > 0) {
setDatasets(arr);
setLoading(false);
} else {
throw new Error("empty");
}
})
.catch(() => {
fetch("/mock/catalog.json")
.then((r) => r.json())
.then((d) => setDatasets(Array.isArray(d) ? d : []))
.catch(() => {})
.finally(() => setLoading(false));
});
}, []);
const maxRecords = Math.max(...datasets.map((d) => d.recordCount ?? 0), 0);
const allThemes = [
...new Set(datasets.map((d) => d.theme).filter(Boolean)),
].sort();
const allTypes = [
...new Set(datasets.map((d) => d.datasetType).filter(Boolean)),
].sort();
const visible = datasets.filter((d) => {
if (
searchText &&
!d.title?.toLowerCase().includes(searchText.toLowerCase()) &&
!d.description?.toLowerCase().includes(searchText.toLowerCase()) &&
!d.theme?.toLowerCase().includes(searchText.toLowerCase())
) {
return false;
}
Iif (selectedThemes.length > 0 && !selectedThemes.includes(d.theme)) {
return false;
}
Iif (selectedTypes.length > 0 && !selectedTypes.includes(d.datasetType)) {
return false;
}
Iif (minSamples > 0 && (d.recordCount ?? 0) < minSamples) {
return false;
}
return true;
});
const toggleTheme = (t: string) =>
setSelectedThemes((prev) =>
prev.includes(t) ? prev.filter((x) => x !== t) : [...prev, t],
);
const toggleType = (t: string) =>
setSelectedTypes((prev) =>
prev.includes(t) ? prev.filter((x) => x !== t) : [...prev, t],
);
const resetFilters = () => {
setSelectedThemes([]);
setSelectedTypes([]);
setMinSamples(0);
setSearchText("");
};
return (
<div className="min-h-screen bg-[var(--bg)]">
<div className="max-w-7xl mx-auto px-6 pb-12 pt-10">
{/* Page header */}
<div className="mb-8 flex flex-col md:flex-row md:items-end justify-between gap-4">
<div className="space-y-1">
<p className="text-xs font-bold text-[var(--text-secondary)] uppercase tracking-widest">
HealthDCAT-AP · EHDS Art. 53
</p>
<h1 className="text-4xl font-extrabold text-[var(--text-primary)] tracking-tight">
Dataset Catalog
</h1>
<p className="text-[var(--text-secondary)] text-base font-medium">
Explore curated FHIR R4 and OMOP datasets for cross-border health
research.
</p>
</div>
<div className="flex items-center gap-3 shrink-0">
{!loading && (
<span className="text-sm font-bold text-[var(--accent)] px-4 py-2 bg-[var(--accent-surface)] rounded-full">
{visible.length} of {datasets.length} datasets
</span>
)}
<input
type="search"
placeholder="Search datasets…"
aria-label="Search datasets"
value={searchText}
onChange={(e) => setSearchText(e.target.value)}
className="px-3 py-2 bg-[var(--surface-card)] border border-[var(--border-ui)] rounded-xl text-sm outline-none focus:border-[var(--accent)] text-[var(--text-primary)] placeholder:text-[var(--text-secondary)] w-52"
/>
</div>
</div>
{loading ? (
<div className="flex items-center gap-2 text-[var(--text-secondary)]">
<Loader2 size={16} className="animate-spin" />
Connecting to Neo4j…
</div>
) : (
<div className="grid grid-cols-12 gap-8">
{/* ── Filter Sidebar ── */}
<aside className="col-span-12 lg:col-span-3">
<div className="bg-[var(--surface)] rounded-xl p-6 sticky top-6">
<h3 className="text-xs font-black text-[var(--text-primary)] uppercase tracking-widest mb-6">
Refine Search
</h3>
{/* Theme filter */}
<div className="mb-6">
<p className="text-[10px] font-bold text-[var(--text-secondary)] uppercase tracking-wider mb-3">
Theme
</p>
<div className="space-y-2">
{allThemes.map((t) => (
<label
key={t}
className="flex items-center gap-3 cursor-pointer group"
>
<input
type="checkbox"
checked={selectedThemes.includes(t)}
onChange={() => toggleTheme(t)}
className="w-4 h-4 rounded accent-[var(--accent)]"
/>
<span className="text-sm font-medium text-[var(--text-primary)] group-hover:text-[var(--accent)] transition-colors">
{t}
</span>
</label>
))}
</div>
</div>
{/* DatasetType filter */}
<div className="mb-6">
<p className="text-[10px] font-bold text-[var(--text-secondary)] uppercase tracking-wider mb-3">
Data Type
</p>
<div className="space-y-2">
{allTypes.map((t) => (
<label
key={t}
className="flex items-center gap-3 cursor-pointer group"
>
<input
type="checkbox"
checked={selectedTypes.includes(t)}
onChange={() => toggleType(t)}
className="w-4 h-4 rounded accent-[var(--accent)]"
/>
<span className="text-sm font-medium text-[var(--text-primary)] group-hover:text-[var(--accent)] transition-colors">
{dataTypeLabel(t)}
</span>
</label>
))}
</div>
</div>
{/* Sample size range */}
<div className="mb-6">
<p className="text-[10px] font-bold text-[var(--text-secondary)] uppercase tracking-wider mb-3">
Min. Sample Size
</p>
<input
type="range"
min={0}
max={maxRecords}
step={100}
value={minSamples}
onChange={(e) => setMinSamples(Number(e.target.value))}
aria-label="Minimum sample size"
className="w-full h-1.5 bg-[var(--border)] rounded-lg appearance-none cursor-pointer accent-[var(--accent)]"
/>
<div className="flex justify-between mt-2 text-[10px] font-bold text-[var(--text-secondary)]">
<span>0</span>
<span>
{minSamples > 0 ? minSamples.toLocaleString() : "Any"}
</span>
<span>{maxRecords.toLocaleString()}</span>
</div>
</div>
<button
onClick={resetFilters}
className="w-full py-2.5 bg-[var(--surface-2)] text-[var(--accent)] font-bold text-xs rounded-lg uppercase tracking-wider hover:bg-[var(--accent)] hover:text-white transition-all flex items-center justify-center gap-2"
>
<RotateCcw size={12} />
Reset All Filters
</button>
</div>
</aside>
{/* ── Main Grid ── */}
<div className="col-span-12 lg:col-span-9">
{/* Sort bar */}
<div className="flex justify-between items-center mb-6">
<p className="text-sm font-semibold text-[var(--text-secondary)]">
{visible.length} dataset{visible.length !== 1 ? "s" : ""}{" "}
found
</p>
<div className="flex items-center gap-2">
<span className="text-xs text-[var(--text-secondary)]">
EHDS Art. 53 · HealthDCAT-AP 2.1
</span>
</div>
</div>
{visible.length === 0 ? (
<div className="surface-card p-8 text-center border border-[var(--border)]">
<Database
size={32}
className="mx-auto mb-3 text-[var(--text-secondary)]"
/>
<p className="text-[var(--text-secondary)]">
No datasets match the current filters.
</p>
<button
onClick={resetFilters}
className="mt-4 text-sm text-[var(--accent)] hover:underline"
>
Clear filters
</button>
</div>
) : (
<div className="grid grid-cols-1 md:grid-cols-2 gap-6">
{visible.map((d, idx) => {
const grad = themeGradient(d.theme);
const status = providerStatus(d.publisher);
return (
<div
key={d.id ?? `dataset-${idx}`}
className="group bg-[var(--surface-card)] rounded-xl overflow-hidden transition-all hover:-translate-y-1 hover:shadow-lg"
>
{/* Gradient header */}
<div
className={`h-32 bg-gradient-to-r ${grad} p-6 relative overflow-hidden`}
>
{/* Dot pattern overlay */}
<div
className="absolute inset-0 opacity-20"
style={{
backgroundImage:
"radial-gradient(circle at 2px 2px, white 1px, transparent 0)",
backgroundSize: "20px 20px",
}}
/>
<div className="relative z-10">
{d.theme && (
<span className="px-3 py-1 bg-white/20 backdrop-blur-md rounded-full text-[10px] font-black text-white uppercase tracking-widest">
{d.theme}
</span>
)}
<h3 className="text-white text-lg font-bold mt-2 leading-tight line-clamp-2">
{d.title ?? d.id}
</h3>
</div>
</div>
{/* Card body */}
<div className="p-6">
{/* Provider status row */}
<div className="flex items-center justify-between mb-4">
<div className="flex items-center gap-2">
<span
className={`w-2 h-2 rounded-full ${status.dotColor}`}
/>
<span
className={`text-xs font-bold uppercase ${status.textColor}`}
>
{status.label}
</span>
</div>
<span className="text-[10px] font-mono text-[var(--text-secondary)]">
{d.license ?? "—"}
</span>
</div>
{/* Stats row */}
<div className="grid grid-cols-3 gap-4 mb-5">
<div className="flex flex-col">
<span className="text-[9px] font-bold text-[var(--text-secondary)] uppercase tracking-wider">
Samples
</span>
<span className="text-sm font-black text-[var(--text-primary)] tabular-nums">
{d.recordCount != null
? Number(d.recordCount).toLocaleString()
: "—"}
</span>
</div>
<div className="flex flex-col">
<span className="text-[9px] font-bold text-[var(--text-secondary)] uppercase tracking-wider">
Data Type
</span>
<span className="text-sm font-black text-[var(--text-primary)]">
{dataTypeLabel(d.datasetType)}
</span>
</div>
<div className="flex flex-col">
<span className="text-[9px] font-bold text-[var(--text-secondary)] uppercase tracking-wider">
Provider
</span>
<span className="text-sm font-black text-[var(--text-primary)]">
{shortPublisher(d.publisher)}
</span>
</div>
</div>
{/* Description */}
<p className="text-sm text-[var(--text-secondary)] leading-relaxed mb-5 line-clamp-2">
{d.description}
</p>
{/* Legal basis tag */}
{d.legalBasis && (
<div className="mb-4">
<span className="text-[10px] font-bold text-[var(--role-hdab-text)] bg-[var(--role-hdab-bg)] border border-[var(--role-hdab-border)] px-2 py-0.5 rounded-full">
{LEGAL_BASIS_LABELS[d.legalBasis] ??
d.legalBasis}
</span>
</div>
)}
{/* Action row */}
<div className="flex items-center justify-between gap-3">
<Link
href={`/negotiate?dataset=${encodeURIComponent(
d.id,
)}`}
className="flex-grow py-2.5 btn-gradient text-center text-sm font-bold rounded-xl active:scale-95 transition-all"
>
Request Access
</Link>
<button
onClick={() => setDetailDataset(d)}
className="w-11 h-11 flex items-center justify-center bg-[var(--surface-2)] text-[var(--text-secondary)] rounded-xl hover:bg-[var(--accent-surface)] hover:text-[var(--accent)] transition-colors"
aria-label="View dataset details"
title="View HealthDCAT-AP metadata"
>
<Bookmark size={16} />
</button>
</div>
</div>
</div>
);
})}
</div>
)}
</div>
</div>
)}
</div>
{/* ── Detail / metadata modal ── */}
{detailDataset && (
<div
className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm"
onClick={() => setDetailDataset(null)}
>
<div
className="bg-[var(--surface)] border border-[var(--border)] rounded-2xl w-full max-w-2xl max-h-[85vh] overflow-y-auto mx-4"
onClick={(e) => e.stopPropagation()}
>
{/* Modal header */}
<div className="flex items-center justify-between px-6 py-4 border-b border-[var(--border)]">
<div className="flex items-center gap-3">
<Database size={18} className="text-[var(--accent)]" />
<div>
<p className="font-bold text-sm text-[var(--text-primary)] line-clamp-1">
{detailDataset.title}
</p>
<p className="text-xs text-[var(--text-secondary)]">
HealthDCAT-AP Metadata
</p>
</div>
</div>
<button
onClick={() => setDetailDataset(null)}
className="text-[var(--text-secondary)] hover:text-[var(--text-primary)]"
aria-label="Close"
>
<X size={18} />
</button>
</div>
<div className="p-6 space-y-4">
{/* Key metadata */}
<div className="bg-[var(--surface-2)] rounded-xl px-4 py-3 space-y-2">
{[
{ label: "Dataset ID", value: detailDataset.id },
{ label: "Publisher", value: detailDataset.publisher },
{
label: "Data Providers",
value: detailDataset.providers?.join(", "),
},
{
label: "Data Consumers",
value: detailDataset.consumers?.join(", "),
},
{
label: "FHIR Patients",
value: detailDataset.fhirResources?.length
? `${detailDataset.fhirResources.length} linked`
: undefined,
},
{
label: "Transfers",
value: detailDataset.transfers?.join(", "),
},
{ label: "Dataset Type", value: detailDataset.datasetType },
{
label: "Legal Basis",
value:
LEGAL_BASIS_LABELS[detailDataset.legalBasis] ??
detailDataset.legalBasis,
},
{
label: "Record Count",
value:
detailDataset.recordCount != null
? Number(detailDataset.recordCount).toLocaleString()
: undefined,
},
{ label: "Theme", value: detailDataset.theme },
{ label: "License", value: detailDataset.license },
{ label: "Conforms To", value: detailDataset.conformsTo },
]
.filter((r) => r.value)
.map((r) => (
<div
key={r.label}
className="flex gap-3 py-1.5 border-b border-[var(--border)] last:border-0"
>
<span className="text-xs text-[var(--text-secondary)] w-32 shrink-0">
{r.label}
</span>
<span className="text-xs text-[var(--text-primary)] break-all">
{r.value}
</span>
</div>
))}
</div>
{/* Provider/consumer badges */}
{((detailDataset.providers &&
detailDataset.providers.length > 0) ||
(detailDataset.consumers &&
detailDataset.consumers.length > 0)) && (
<div className="flex flex-wrap gap-2">
{detailDataset.providers?.map((p) => (
<span
key={p}
className="flex items-center gap-1 text-xs px-2 py-1 rounded-full bg-[var(--role-holder-bg)] text-[var(--role-holder-text)] border border-[var(--role-holder-border)]"
>
<ShieldCheck size={10} />
{p}
</span>
))}
{detailDataset.consumers?.map((c) => (
<span
key={c}
className="flex items-center gap-1 text-xs px-2 py-1 rounded-full bg-[var(--role-user-bg)] text-[var(--role-user-text)] border border-[var(--role-user-border)]"
>
<Users size={10} />
{c}
</span>
))}
</div>
)}
{/* Action links */}
<div className="flex flex-wrap gap-3 pt-2">
<button
onClick={() => {
setDiagramDataset(detailDataset);
setDetailDataset(null);
}}
className="inline-flex items-center gap-1.5 text-xs text-[var(--accent)] hover:underline font-medium"
>
<GitBranch size={12} />
Data Model Diagram
</button>
<button
onClick={() => downloadDcatAp(detailDataset)}
className="inline-flex items-center gap-1.5 text-xs text-[var(--accent)] hover:underline font-medium"
>
<Download size={12} />
Download DCAT-AP
</button>
<Link
href={`/graph?highlight=${encodeURIComponent(
detailDataset.title || detailDataset.id,
)}`}
className="inline-flex items-center gap-1.5 text-xs text-[var(--accent)] hover:underline font-medium"
onClick={() => setDetailDataset(null)}
>
<Network size={12} />
View in Graph
</Link>
<a
href="https://ehds.healthdataportal.eu/editor2/"
target="_blank"
rel="noopener noreferrer"
className="inline-flex items-center gap-1.5 text-xs text-[var(--text-secondary)] hover:text-[var(--accent)] hover:underline font-medium"
>
<Edit3 size={12} />
EHDS DCAT-AP Editor
</a>
<a
href="https://healthdataeu.pages.code.europa.eu/healthdcat-ap/releases/release-6/index.html"
target="_blank"
rel="noopener noreferrer"
className="inline-flex items-center gap-1.5 text-xs text-[var(--text-secondary)] hover:text-[var(--accent)] hover:underline font-medium"
>
<ExternalLink size={12} />
HealthDCAT-AP Spec
</a>
</div>
</div>
</div>
</div>
)}
{/* ── DCAT-AP data model diagram modal ── */}
{diagramDataset && (
<div
className="fixed inset-0 z-50 flex items-center justify-center bg-black/70 backdrop-blur-sm"
onClick={() => setDiagramDataset(null)}
>
<div
className="bg-[var(--surface)] border border-[var(--border)] rounded-2xl w-full max-w-3xl max-h-[85vh] overflow-y-auto mx-4"
onClick={(e) => e.stopPropagation()}
>
<div className="flex items-center justify-between px-5 py-3 border-b border-[var(--border)]">
<h2 className="font-semibold text-sm text-[var(--accent)]">
<GitBranch size={14} className="inline mr-1.5" />
HealthDCAT-AP Data Model — {diagramDataset.title}
</h2>
<button
onClick={() => setDiagramDataset(null)}
className="text-[var(--text-secondary)] hover:text-[var(--text-primary)]"
aria-label="Close diagram"
>
<X size={18} />
</button>
</div>
<div className="p-5">
<MermaidDiagram
chart={buildDcatApDiagram(diagramDataset)}
caption={`HealthDCAT-AP entity-relationship model for "${diagramDataset.title}"`}
/>
</div>
</div>
</div>
)}
</div>
);
}
|