dianping/cat · error · StaticError

XQST0088

XQST0088

Error message

empty target namespace in module import or module declaration

What it means

XQST0088 is the standard XQuery error for an empty target namespace in a module import or module declaration. addNamespace() raises it whenever uri === '' — a module boundary (import or 'module namespace ...') must name a non-empty namespace URI, because module components are addressed by namespace.

Source

Thrown at cat-home/src/main/webapp/assets/js/editor/worker-xquery.js:1804

                    }
                } catch(e) {
                    throw new StaticError('XQST0059', 'module "' + uri + '" not found', pos);
                }
            }
            return this;
        },
        getAvailableModuleNamespaces: function(){
            return this.root.availableModuleNamespaces;
        },
        getPrefixByNamespace: function(uri){
            return this.root.namespaces[uri].prefix;
        },
        addNamespace: function (uri, prefix, pos, type) {
            if(prefix === '' && type === 'module') {
                throw new StaticWarning('W01', 'Avoid this type of import. Use import module namespace instead', pos);
            }
            if (uri === '') {
                throw new StaticError('XQST0088', 'empty target namespace in module import or module declaration', pos);
            }
            var namespace = this.getNamespace(uri);
            if (namespace && namespace.type === type && type !== 'declare' && !namespace.override) {
                throw new StaticError('XQST0047', '"' + uri + '": duplicate target namespace', pos);
            }
            namespace = this.getNamespaceByPrefix(prefix);
            if (namespace && !namespace.override) {
                throw new StaticError('XQST0033', '"' + prefix + '": namespace prefix already bound to "' + namespace.uri + '"', pos);
            }

            namespace = this.namespaces[uri];
            this.namespaces[uri] = {
                prefix: prefix,
                pos: pos,
                type: type
            };

            if (namespace) {

View on GitHub (pinned to e815e74d4c)

Solutions

1. Fill in a real, absolute namespace URI in the import/declaration.
2. If the query is generated, validate that the namespace variable is non-empty before emitting the import.
3. Distinguish module imports from schema imports — only module boundaries require a target namespace here.

Example fix

// before
module namespace "";

// after
module namespace util = "http://example.org/xquery/util";

// Ensure generated prologs never emit an empty target namespace
if (moduleUri === undefined || moduleUri === '') {
  throw new Error('moduleUri required for module import: ' + moduleName);
}

function isNonEmptyNamespace(uri) {
  return typeof uri === 'string' && uri.trim().length > 0;
}

if (e.code === 'XQST0088') {
  highlight(e.pos, 'Module import/declaration needs a non-empty namespace URI');
}

When it happens

Trigger: addNamespace('', prefix, pos, type) — e.g. 'import module namespace p = "";' or 'module namespace "";' after prefix/QName expansion produced an empty URI.

Common situations: Copy-paste imports where the URI string was deleted; templates with placeholder quotes; queries built by string concatenation where the namespace variable is undefined/empty.

Related errors

• W01
• XQST0047
• XQST0059
• XQST0033
• W02

AI-assisted analysis of dianping/cat@e815e74d4c (2026-08-14). Data as JSON: /api/errors/ade693294de04d41. Report an issue: GitHub.