feat(document_il): add baseOperations element to PDFXobject

- introduce new element `baseOperations` in rnc, xsd, and rng files
- update il_version_1.py to include `baseOperations` field
- add `on_xobj_end` method in il_creater.py for handling base operations

yadt/document_il/frontend/il_creater.py

@@ -92,6 +92,11 @@ def on_xobj_begin(self, bbox):
                 xobj_id=self.xobj_id,
             )
         )
+        return self.xobj_id
+
+    def on_xobj_end(self, xobj_id, base_op):
+        pass
+
     def on_page_start(self):
         self.current_page = il_version_1.Page(
             pdf_font=[],

yadt/document_il/il_version_1.py

@@ -304,6 +304,14 @@ class Meta:
             "required": True,
         },
     )
+    base_operations: Optional[BaseOperations] = field(
+        default=None,
+        metadata={
+            "name": "baseOperations",
+            "type": "Element",
+            "required": True,
+        },
+    )
     xobj_id: Optional[int] = field(
         default=None,
         metadata={

yadt/document_il/il_version_1.rnc

@@ -41,7 +41,8 @@ PDFFont =
 PDFXobject =
   element pdfXobject {
     attribute xobjId { xsd:int },
-    Box
+    Box,
+    element baseOperations { xsd:string }
   }
 PDFCharacter =
   element pdfCharacter {

yadt/document_il/il_version_1.rng

@@ -112,6 +112,9 @@
         <data type="int"/>
       </attribute>
       <ref name="Box"/>
+      <element name="baseOperations">
+        <data type="string"/>
+      </element>
     </element>
   </define>
   <define name="PDFCharacter">

yadt/document_il/il_version_1.xsd

@@ -67,6 +67,7 @@
     <xs:complexType>
       <xs:sequence>
         <xs:element ref="box"/>
+        <xs:element ref="baseOperations"/>
       </xs:sequence>
       <xs:attribute name="xobjId" use="required" type="xs:int"/>
     </xs:complexType>