Fix rebase

internal/linkedql/schema/schema.go

@@ -10,7 +10,6 @@ import (
 	_ "github.com/cayleygraph/cayley/query/linkedql/steps"
 	"github.com/cayleygraph/quad"
 	"github.com/cayleygraph/quad/voc/owl"
-	"github.com/cayleygraph/quad/voc/rdf"
 	"github.com/cayleygraph/quad/voc/rdfs"
 	"github.com/cayleygraph/quad/voc/xsd"
 )
@@ -347,11 +346,11 @@ func (g *generator) Generate() []byte {
 	graph = append(graph, g.out...)
 	data, err := json.Marshal(map[string]interface{}{
 		"@context": map[string]interface{}{
-			"rdf":      rdf.NS,
-			"rdfs":     rdfs.NS,
-			"owl":      owl.NS,
-			"xsd":      xsd.NS,
-			"linkedql": linkedql.Namespace,
+			"rdf":      "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
+			"rdfs":     "http://www.w3.org/2000/01/rdf-schema#",
+			"owl":      "http://www.w3.org/2002/07/owl#",
+			"xsd":      "http://www.w3.org/2001/XMLSchema#",
+			"linkedql": "http://cayley.io/linkedql#",
 			"rdfg":     rdfgNamespace,
 		},
 		"@graph": graph,

query/linkedql/registry_test.go

@@ -93,7 +93,7 @@ var unmarshalCases = []struct {
 type TestStep struct {
 	Limit int        `json:"limit"`
 	Tags  []string   `json:"tags"`
-	From  PathStep   `json:"from"`
+	From  PathStep   `json:"from" minCardinality:"0"`
 	Sub   []PathStep `json:"sub"`
 }
 

query/linkedql/steps/as.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*As)(nil)
 
 // As corresponds to .tag().
 type As struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	Name string            `json:"name"`
 }
 

query/linkedql/steps/back.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Back)(nil)
 
 // Back corresponds to .back().
 type Back struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	Name string            `json:"name"`
 }
 

query/linkedql/steps/both.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Both)(nil)
 
 // Both corresponds to .both().
 type Both struct {
-	From       linkedql.PathStep     `json:"from"`
+	From       linkedql.PathStep     `json:"from" minCardinality:"0"`
 	Properties linkedql.PropertyPath `json:"properties"`
 }
 

query/linkedql/steps/context.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Context)(nil)
 
 // Context corresponds to context().
 type Context struct {
-	From  linkedql.PathStep `json:"from"`
+	From  linkedql.PathStep `json:"from" minCardinality:"0"`
 	Rules map[string]string `json:"rules"`
 }
 

query/linkedql/steps/count.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Count)(nil)
 
 // Count corresponds to .count().
 type Count struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/difference.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Difference)(nil)
 
 // Difference corresponds to .difference().
 type Difference struct {
-	From  linkedql.PathStep   `json:"from"`
+	From  linkedql.PathStep   `json:"from" minCardinality:"0"`
 	Steps []linkedql.PathStep `json:"steps"`
 }
 

query/linkedql/steps/follow.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Follow)(nil)
 
 // Follow corresponds to .follow().
 type Follow struct {
-	From     linkedql.PathStep `json:"from"`
+	From     linkedql.PathStep `json:"from" minCardinality:"0"`
 	Followed linkedql.PathStep `json:"followed"`
 }
 

query/linkedql/steps/follow_reverse.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*FollowReverse)(nil)
 
 // FollowReverse corresponds to .followR().
 type FollowReverse struct {
-	From     linkedql.PathStep `json:"from"`
+	From     linkedql.PathStep `json:"from" minCardinality:"0"`
 	Followed linkedql.PathStep `json:"followed"`
 }
 

query/linkedql/steps/greater_than.go

@@ -19,7 +19,7 @@ var _ linkedql.PathStep = (*GreaterThan)(nil)
 
 // GreaterThan corresponds to gt().
 type GreaterThan struct {
-	From  linkedql.PathStep `json:"from"`
+	From  linkedql.PathStep `json:"from" minCardinality:"0"`
 	Value quad.Value        `json:"value"`
 }
 

query/linkedql/steps/greater_than_equals.go

@@ -19,7 +19,7 @@ var _ linkedql.PathStep = (*GreaterThanEquals)(nil)
 
 // GreaterThanEquals corresponds to gte().
 type GreaterThanEquals struct {
-	From  linkedql.PathStep `json:"from"`
+	From  linkedql.PathStep `json:"from" minCardinality:"0"`
 	Value quad.Value        `json:"value"`
 }
 

query/linkedql/steps/has.go

@@ -18,7 +18,7 @@ var _ linkedql.PathStep = (*Has)(nil)
 
 // Has corresponds to .has().
 type Has struct {
-	From     linkedql.PathStep     `json:"from"`
+	From     linkedql.PathStep     `json:"from" minCardinality:"0"`
 	Property linkedql.PropertyPath `json:"property"`
 	Values   []quad.Value          `json:"values"`
 }

query/linkedql/steps/has_reverse.go

@@ -18,7 +18,7 @@ var _ linkedql.PathStep = (*HasReverse)(nil)
 
 // HasReverse corresponds to .hasR().
 type HasReverse struct {
-	From     linkedql.PathStep     `json:"from"`
+	From     linkedql.PathStep     `json:"from" minCardinality:"0"`
 	Property linkedql.PropertyPath `json:"property"`
 	Values   []quad.Value          `json:"values"`
 }

query/linkedql/steps/intersect.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Intersect)(nil)
 
 // Intersect represents .intersect() and .and().
 type Intersect struct {
-	From  linkedql.PathStep   `json:"from"`
+	From  linkedql.PathStep   `json:"from" minCardinality:"0"`
 	Steps []linkedql.PathStep `json:"steps"`
 }
 

query/linkedql/steps/is.go

@@ -18,7 +18,7 @@ var _ linkedql.PathStep = (*Is)(nil)
 
 // Is corresponds to .back().
 type Is struct {
-	From   linkedql.PathStep `json:"from"`
+	From   linkedql.PathStep `json:"from" minCardinality:"0"`
 	Values []quad.Value      `json:"values"`
 }
 

query/linkedql/steps/labels.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Labels)(nil)
 
 // Labels corresponds to .labels().
 type Labels struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/less_than.go

@@ -20,7 +20,7 @@ var _ linkedql.PathStep = (*LessThan)(nil)
 
 // LessThan corresponds to lt().
 type LessThan struct {
-	From  linkedql.PathStep   `json:"from"`
+	From  linkedql.PathStep   `json:"from" minCardinality:"0"`
 	Value quad.Value `json:"value"`
 }
 

query/linkedql/steps/less_than_equals.go

@@ -19,7 +19,7 @@ var _ linkedql.PathStep = (*LessThanEquals)(nil)
 
 // LessThanEquals corresponds to lte().
 type LessThanEquals struct {
-	From  linkedql.PathStep `json:"from"`
+	From  linkedql.PathStep `json:"from" minCardinality:"0"`
 	Value quad.Value        `json:"value"`
 }
 

query/linkedql/steps/limit.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Limit)(nil)
 
 // Limit corresponds to .limit().
 type Limit struct {
-	From  linkedql.PathStep `json:"from"`
+	From  linkedql.PathStep `json:"from" minCardinality:"0"`
 	Limit int64             `json:"limit"`
 }
 

query/linkedql/steps/optional.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Optional)(nil)
 
 // Optional corresponds to .optional().
 type Optional struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	Step linkedql.PathStep `json:"step"`
 }
 

query/linkedql/steps/order.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Order)(nil)
 
 // Order corresponds to .order().
 type Order struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/properties.go

@@ -18,7 +18,7 @@ var _ linkedql.PathStep = (*Properties)(nil)
 
 // Properties corresponds to .properties().
 type Properties struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	// TODO(iddan): Use linkedql.PropertyPath
 	Names []quad.IRI `json:"names"`
 }

query/linkedql/steps/property_names.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*PropertyNames)(nil)
 
 // PropertyNames corresponds to .propertyNames().
 type PropertyNames struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/property_names_as.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*PropertyNamesAs)(nil)
 
 // PropertyNamesAs corresponds to .propertyNamesAs().
 type PropertyNamesAs struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	Tag  string            `json:"tag"`
 }
 

query/linkedql/steps/reverse_properties.go

@@ -18,7 +18,7 @@ var _ linkedql.PathStep = (*ReverseProperties)(nil)
 
 // ReverseProperties corresponds to .reverseProperties().
 type ReverseProperties struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	// TODO(iddan): Use property path
 	Names []quad.IRI `json:"names"`
 }

query/linkedql/steps/reverse_property_names.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*ReversePropertyNames)(nil)
 
 // ReversePropertyNames corresponds to .reversePropertyNames().
 type ReversePropertyNames struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/reverse_property_names_as.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*ReversePropertyNamesAs)(nil)
 
 // ReversePropertyNamesAs corresponds to .reversePropertyNamesAs().
 type ReversePropertyNamesAs struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 	Tag  string            `json:"tag"`
 }
 

query/linkedql/steps/skip.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Skip)(nil)
 
 // Skip corresponds to .skip().
 type Skip struct {
-	From   linkedql.PathStep `json:"from"`
+	From   linkedql.PathStep `json:"from" minCardinality:"0"`
 	Offset int64             `json:"offset"`
 }
 

query/linkedql/steps/steps_final.go

@@ -19,7 +19,7 @@ var _ linkedql.IteratorStep = (*Select)(nil)
 // Select corresponds to .select().
 type Select struct {
 	Tags []string          `json:"tags"`
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.
@@ -41,7 +41,7 @@ var _ linkedql.IteratorStep = (*SelectFirst)(nil)
 // SelectFirst corresponds to .selectFirst().
 type SelectFirst struct {
 	Tags []string          `json:"tags"`
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.
@@ -70,7 +70,7 @@ var _ linkedql.IteratorStep = (*Value)(nil)
 
 // Value corresponds to .value().
 type Value struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.
@@ -87,7 +87,7 @@ var _ linkedql.IteratorStep = (*Documents)(nil)
 
 // Documents corresponds to .documents().
 type Documents struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/union.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Union)(nil)
 
 // Union corresponds to .union() and .or().
 type Union struct {
-	From  linkedql.PathStep   `json:"from"`
+	From  linkedql.PathStep   `json:"from" minCardinality:"0"`
 	Steps []linkedql.PathStep `json:"steps"`
 }
 

query/linkedql/steps/unique.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Unique)(nil)
 
 // Unique corresponds to .unique().
 type Unique struct {
-	From linkedql.PathStep `json:"from"`
+	From linkedql.PathStep `json:"from" minCardinality:"0"`
 }
 
 // Description implements Step.

query/linkedql/steps/visit.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Visit)(nil)
 
 // Visit corresponds to .view().
 type Visit struct {
-	From       linkedql.PathStep     `json:"from"`
+	From       linkedql.PathStep     `json:"from" minCardinality:"0"`
 	Properties linkedql.PropertyPath `json:"properties"`
 }
 

query/linkedql/steps/visit_reverse.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*VisitReverse)(nil)
 
 // VisitReverse corresponds to .viewReverse().
 type VisitReverse struct {
-	From       linkedql.PathStep     `json:"from"`
+	From       linkedql.PathStep     `json:"from" minCardinality:"0"`
 	Properties linkedql.PropertyPath `json:"properties"`
 }
 

query/linkedql/steps/where.go

@@ -17,7 +17,7 @@ var _ linkedql.PathStep = (*Where)(nil)
 
 // Where corresponds to .where().
 type Where struct {
-	From  linkedql.PathStep   `json:"from"`
+	From  linkedql.PathStep   `json:"from" minCardinality:"0"`
 	Steps []linkedql.PathStep `json:"steps"`
 }