diff --git a/dhp-schemas/pom.xml b/dhp-schemas/pom.xml
index f074fb241..20896a61d 100644
--- a/dhp-schemas/pom.xml
+++ b/dhp-schemas/pom.xml
@@ -21,6 +21,17 @@
             <artifactId>commons-io</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>eu.dnetlib.dhp</groupId>
+            <artifactId>dhp-common</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
 
     </dependencies>
 
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Entity.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Entity.java
new file mode 100644
index 000000000..894d54eaf
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Entity.java
@@ -0,0 +1,118 @@
+package eu.dnetlib.dhp.schema.dli;
+
+import java.io.Serializable;
+import java.util.List;
+
+public class Entity implements Serializable {
+
+    private String identifier;
+
+    private List<Pid> pid;
+
+    private List<String> title;
+
+    private List<String> date;
+
+    private String typology;
+
+    private List<String> authors;
+
+    private List<Subject> subject;
+
+    private String description;
+
+    private String completionStatus;
+
+    private List<Provenance> collectedFrom;
+
+    private List<String> publisher;
+
+
+    public String getIdentifier() {
+        return identifier;
+    }
+
+    public void setIdentifier(String identifier) {
+        this.identifier = identifier;
+    }
+
+    public List<Pid> getPid() {
+        return pid;
+    }
+
+    public void setPid(List<Pid> pid) {
+        this.pid = pid;
+    }
+
+    public List<String> getTitle() {
+        return title;
+    }
+
+    public void setTitle(List<String> title) {
+        this.title = title;
+    }
+
+    public List<String> getDate() {
+        return date;
+    }
+
+    public void setDate(List<String> date) {
+        this.date = date;
+    }
+
+    public String getTypology() {
+        return typology;
+    }
+
+    public void setTypology(String typology) {
+        this.typology = typology;
+    }
+
+    public List<String> getAuthors() {
+        return authors;
+    }
+
+    public void setAuthors(List<String> authors) {
+        this.authors = authors;
+    }
+
+    public List<Subject> getSubject() {
+        return subject;
+    }
+
+    public void setSubject(List<Subject> subject) {
+        this.subject = subject;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public List<Provenance> getCollectedFrom() {
+        return collectedFrom;
+    }
+
+    public void setCollectedFrom(List<Provenance> collectedFrom) {
+        this.collectedFrom = collectedFrom;
+    }
+
+    public List<String> getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(List<String> publisher) {
+        this.publisher = publisher;
+    }
+
+    public String getCompletionStatus() {
+        return completionStatus;
+    }
+
+    public void setCompletionStatus(String completionStatus) {
+        this.completionStatus = completionStatus;
+    }
+}
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Pid.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Pid.java
new file mode 100644
index 000000000..252245f45
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Pid.java
@@ -0,0 +1,33 @@
+package eu.dnetlib.dhp.schema.dli;
+
+import eu.dnetlib.dhp.utils.DHPUtils;
+import org.apache.commons.lang3.StringUtils;
+
+public class Pid {
+
+    private String pid;
+
+    private String pidType;
+
+    public String getPid() {
+        return pid;
+    }
+
+    public void setPid(String pid) {
+        this.pid = pid;
+    }
+
+    public String getPidType() {
+        return pidType;
+    }
+
+    public void setPidType(String pidType) {
+        this.pidType = pidType;
+    }
+
+    public String generateId() {
+        if(StringUtils.isEmpty(pid) || StringUtils.isEmpty(pidType))
+            return null;
+        return DHPUtils.md5(String.format("%s::%s", pid, pidType));
+    }
+}
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Provenance.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Provenance.java
new file mode 100644
index 000000000..300b1134b
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Provenance.java
@@ -0,0 +1,35 @@
+package eu.dnetlib.dhp.schema.dli;
+
+public class Provenance {
+
+    private String datasourceId;
+
+    private String datasourceName;
+
+    private String completionStatus;
+
+
+    public String getDatasourceId() {
+        return datasourceId;
+    }
+
+    public void setDatasourceId(String datasourceId) {
+        this.datasourceId = datasourceId;
+    }
+
+    public String getDatasourceName() {
+        return datasourceName;
+    }
+
+    public void setDatasourceName(String datasourceName) {
+        this.datasourceName = datasourceName;
+    }
+
+    public String getCompletionStatus() {
+        return completionStatus;
+    }
+
+    public void setCompletionStatus(String completionStatus) {
+        this.completionStatus = completionStatus;
+    }
+}
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Relation.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Relation.java
new file mode 100644
index 000000000..b83cccb73
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Relation.java
@@ -0,0 +1,47 @@
+package eu.dnetlib.dhp.schema.dli;
+
+import java.io.Serializable;
+import java.util.List;
+
+public class Relation implements Serializable {
+
+    private String source;
+
+    private String target;
+
+    private List<Provenance> provenance;
+
+    private RelationSemantic semantic;
+
+    public String getSource() {
+        return source;
+    }
+
+    public void setSource(String source) {
+        this.source = source;
+    }
+
+    public String getTarget() {
+        return target;
+    }
+
+    public void setTarget(String target) {
+        this.target = target;
+    }
+
+    public List<Provenance> getProvenance() {
+        return provenance;
+    }
+
+    public void setProvenance(List<Provenance> provenance) {
+        this.provenance = provenance;
+    }
+
+    public RelationSemantic getSemantic() {
+        return semantic;
+    }
+
+    public void setSemantic(RelationSemantic semantic) {
+        this.semantic = semantic;
+    }
+}
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/RelationSemantic.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/RelationSemantic.java
new file mode 100644
index 000000000..ff871ef2d
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/RelationSemantic.java
@@ -0,0 +1,16 @@
+package eu.dnetlib.dhp.schema.dli;
+
+import java.io.Serializable;
+
+public class RelationSemantic extends Subject implements Serializable {
+
+    public String inverse;
+
+    public String getInverse() {
+        return inverse;
+    }
+
+    public void setInverse(String inverse) {
+        this.inverse = inverse;
+    }
+}
diff --git a/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Subject.java b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Subject.java
new file mode 100644
index 000000000..bd89bc6dd
--- /dev/null
+++ b/dhp-schemas/src/main/java/eu/dnetlib/dhp/schema/dli/Subject.java
@@ -0,0 +1,35 @@
+package eu.dnetlib.dhp.schema.dli;
+
+import java.io.Serializable;
+
+public class Subject implements Serializable {
+
+    private String schema;
+
+    private String value;
+
+    public Subject() {
+
+    }
+
+    public Subject(String schema, String value) {
+        this.schema = schema;
+        this.value = value;
+    }
+
+    public String getSchema() {
+        return schema;
+    }
+
+    public void setSchema(String schema) {
+        this.schema = schema;
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+}
diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
index c713e235e..2a8703f86 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/graph/SparkGraphImporterJobTest.java
@@ -35,5 +35,4 @@ public class SparkGraphImporterJobTest {
             //Assert.assertEquals(String.format("mapped %s must be %s", t._1(), MAX), MAX, t._2().longValue());
         });
     }
-
 }