In 1.0 mode, only consider terms ending in a delimiter for compact IRI prefixes. In 1.1 mode, also consider those with @prefix.

Author: gkellogg

lib/compact.js

@@ -653,14 +653,15 @@ api.compactIri = ({
   for(let i = partialMatches.length - 1; i >= 0; --i) {
     const entry = partialMatches[i];
     const terms = entry.terms;
-    for(let ti = 0; ti < terms.length; ++ti) {
+    for(let term of terms) {
       // a CURIE is usable if:
       // 1. it has no mapping, OR
       // 2. value is null, which means we're not compacting an @value, AND
       //   the mapping matches the IRI
-      const curie = terms[ti] + ':' + iri.substr(entry.iri.length);
-      const isUsableCurie = (!(curie in activeCtx.mappings) ||
-        (value === null && activeCtx.mappings[curie]['@id'] === iri));
+      const curie = term + ':' + iri.substr(entry.iri.length);
+      const isUsableCurie = (activeCtx.mappings[term]._prefix &&
+        (!(curie in activeCtx.mappings) ||
+        (value === null && activeCtx.mappings[curie]['@id'] === iri)));
 
       // select curie if it is shorter or the same length but lexicographically
       // less than the current choice

lib/context.js

@@ -240,7 +240,9 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
   }
 
   // convert short-hand value to object w/@id
+  let simpleTerm = false;
   if(_isString(value)) {
+    simpleTerm = true;
     value = {'@id': value};
   }
 
@@ -261,7 +263,7 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
 
   // JSON-LD 1.1 support
   if(api.processingMode(activeCtx, 1.1)) {
-    validKeys.push('@context');
+    validKeys.push('@context', '@prefix');
   }
 
   for(let kw in value) {
@@ -273,6 +275,11 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
     }
   }
 
+  // always compute whether term has a colon as an optimization for
+  // _compactIri
+  const colon = term.indexOf(':');
+  mapping._termHasColon = (colon !== -1);
+
   if('@reverse' in value) {
     if('@id' in value) {
       throw new JsonLdError(
@@ -318,14 +325,13 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
           {code: 'invalid IRI mapping', context: localCtx});
       }
       mapping['@id'] = id;
+      // indicate if this term may be used as a compact IRI prefix
+      mapping._prefix = (!mapping._termHasColon &&
+        id.match(/[:\/\?#\[\]@]$/) &&
+        (simpleTerm || !activeCtx.processingMode || activeCtx.processingMode == 'json-ld-1.0'));
     }
   }
 
-  // always compute whether term has a colon as an optimization for
-  // _compactIri
-  const colon = term.indexOf(':');
-  mapping._termHasColon = (colon !== -1);
-
   if(!('@id' in mapping)) {
     // see if the term has a prefix
     if(mapping._termHasColon) {
@@ -478,6 +484,24 @@ api.createTermDefinition = (activeCtx, localCtx, term, defined) => {
     mapping['@language'] = language;
   }
 
+  // term may be used as a prefix
+  if('@prefix' in value) {
+    if(mapping._termHasColon) {
+      throw new JsonLdError(
+        'Invalid JSON-LD syntax; @context @prefix used on a compact IRI term',
+        'jsonld.SyntaxError',
+        {code: 'invalid term definition', context: localCtx});
+    }
+    if(value['@prefix'] === true || value['@prefix'] === false) {
+      mapping._prefix = value['@prefix'] === true
+    } else {
+      throw new JsonLdError(
+        'Invalid JSON-LD syntax; @context value for @prefix must be boolean',
+        'jsonld.SyntaxError',
+        {code: 'invalid @prefix value', context: localCtx});
+    }
+  }
+
   // disallow aliasing @context and @preserve
   const id = mapping['@id'];
   if(id === '@context' || id === '@preserve') {
@@ -861,6 +885,7 @@ api.isKeyword = v => {
   case '@list':
   case '@none':
   case '@omitDefault':
+  case '@prefix':
   case '@preserve':
   case '@requireAll':
   case '@reverse':

tests/test-common.js

@@ -29,7 +29,8 @@ const manifest = options.manifest || {
 const TEST_TYPES = {
   'jld:CompactTest': {
     skip: {
-      regex: [/#t0073/, /#t[anp]/]
+      specVersion: ['json-ld-1.0'],
+      regex: [/#t0073/, /#t[n]/]
     },
     fn: 'compact',
     params: [