The entity &bar; is not defined

Question

I'm trying to call an external DTD to my xml file and I proceeded like this :

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="https://digi.ub.uni-heidelberg.de/schema/tei/heiEDITIONS/tei_hes.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>
<?xml-model href="https://digi.ub.uni-heidelberg.de/schema/tei/heiEDITIONS/tei_hes.rng" type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<!DOCTYPE TEI
[
<!ENTITY % heiEDITIONS_entities SYSTEM "https://digi.ub.uni-heidelberg.de/schema/tei/heiEDITIONS/declarations/heieditions-entities.txt">
%heiEDITIONS_entities; ]>

All the DTD entities can be found at the address declared by the ENTITY section.

However when I meet an entity in my xml file, for exemple &bar; it says that this entity is not declared. Same for ï entity. Though it is when you see the entities in the url ! So I don't understand.

I am using Sublime text as text editor.

Where am I doing wrong ?

thanks a lot

Answer 1

Due to security concerns about XML External Entity (XXE) attacks, many processors now disable external DTD fetching by default. That results in your entities being undefined.

Depending upon the tool/processor, you may need to figure out how to enable external entity resolution.

https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html