# Huge text node in model/settings XML file error **URL:** \ **Category:** User Support\ **Created:** [January 16, 2024, 7:06pm UTC](https://openmc.discourse.group/t/huge-text-node-in-model-settings-xml-file-error/3835 "2024-01-16T19:06:03Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Edgar](https://avatars.discourse-cdn.com/v4/letter/e/b487fb/32.png) [@Edgar](https://openmc.discourse.group/u/Edgar)\ **Post date:** [January 16, 2024, 7:06pm UTC](https://openmc.discourse.group/t/huge-text-node-in-model-settings-xml-file-error/3835/1 "2024-01-16T19:06:03Z")
Hello everyone! Ran into an issue with a model xml that includes a large source mesh, ~1 million tets. If I write out to an XML settings.xml or model.xml then try to read it in, the parser aborts when it reaches the text node that defines the strengths. Unfortunately I can’t just run the model from the command line since it includes dagmc geometry. The error looks like this: ```auto >>> import openmc >>> settings = openmc.Settings.from_xml('settingsLi6_10.xml') Traceback (most recent call last): File "", line 1, in File "/usr/local/lib/python3.9/dist-packages/openmc/settings.py", line 1955, in from_xml tree = ET.parse(path) File "src/lxml/etree.pyx", line 3541, in lxml.etree.parse File "src/lxml/parser.pxi", line 1879, in lxml.etree._parseDocument File "src/lxml/parser.pxi", line 1905, in lxml.etree._parseDocumentFromURL File "src/lxml/parser.pxi", line 1808, in lxml.etree._parseDocFromFile File "src/lxml/parser.pxi", line 1180, in lxml.etree._BaseParser._parseDocFromFile File "src/lxml/parser.pxi", line 618, in lxml.etree._ParserContext._handleParseResultDoc File "src/lxml/parser.pxi", line 728, in lxml.etree._handleParseResult File "src/lxml/parser.pxi", line 657, in lxml.etree._raiseParseError File "settingsLi6_10.xml", line 8 lxml.etree.XMLSyntaxError: xmlSAX2Characters: huge text node, line 8, column 10003731 ``` Was wondering if there is a parameter I can pass somewhere to alleviate this or if it is a current limitation of OpenMC? ---
**Author:** ![yrrepy](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/yrrepy/32/2365_2.png) [@yrrepy](https://openmc.discourse.group/u/yrrepy)\ **Post date:** [January 16, 2024, 8:02pm UTC](https://openmc.discourse.group/t/huge-text-node-in-model-settings-xml-file-error/3835/2 "2024-01-16T20:02:15Z")
Hi Edgar, I had the same issue, but with geometry.py I submitted a pull-request > > > \# Description > Enabled lxml support for very deep trees and very long text conte…nt in the geometry Python class. (huge\_tree=true) > > For large lattices with many elements (\>~500,000 elements) the Python Universe plotter would fail due to the "huge text node". With this change I can successfully universe.py plot my highly detailed voxel lattice. > > The change implemented follows that counselled here: > https://stackoverflow.com/questions/11850345/using-python-lxml-etree-for-huge-xml-files > > Fixes: > The error appearing during universe.py plotting was: > \`\`\` > Traceback (most recent call last): > File "/home/abc/Projects/UniversePlotter.py", line 116, in \ > my\_geometry=openmc.Geometry.from\_xml(); > File "/home/abc/.local/lib/python3.10/site-packages/openmc/geometry.py", line 296, in from\_xml > tree = ET.parse(path) > File "src/lxml/etree.pyx", line 3541, in lxml.etree.parse > File "src/lxml/parser.pxi", line 1879, in lxml.etree.\_parseDocument > File "src/lxml/parser.pxi", line 1905, in lxml.etree.\_parseDocumentFromURL > File "src/lxml/parser.pxi", line 1808, in lxml.etree.\_parseDocFromFile > File "src/lxml/parser.pxi", line 1180, in lxml.etree.\_BaseParser.\_parseDocFromFile > File "src/lxml/parser.pxi", line 618, in lxml.etree.\_ParserContext.\_handleParseResultDoc > File "src/lxml/parser.pxi", line 728, in lxml.etree.\_handleParseResult > File "src/lxml/parser.pxi", line 657, in lxml.etree.\_raiseParseError > File "geometry.xml", line 435 > lxml.etree.XMLSyntaxError: xmlSAX2Characters: huge text node, line 435, column 10000881 > \`\`\` > > > \# Checklist > > \- \[x\] I have performed a self-review of my own code > \- \[\] I have run \[clang-format\](https://docs.openmc.org/en/latest/devguide/styleguide.html#automatic-formatting) (version 15) on any C++ source files (if applicable) > \- \[x\] I have followed the \[style guidelines\](https://docs.openmc.org/en/latest/devguide/styleguide.html#python) for Python source files (if applicable) > ~- \[\] I have made corresponding changes to the documentation (if applicable)~ > ~- \[\] I have added tests that prove my fix is effective or that my feature works (if applicable)~ But haven’t gotten any takers yet ☹ I suspect you can take what I did there, adapt it to settings.py, compile, install. And it will work. Probably a number of these Python files need the large text node correction. Perry ---
**Author:** ![paulromano](https://yyz2.discourse-cdn.com/free1/user_avatar/openmc.discourse.group/paulromano/32/486_2.png) [@paulromano](https://openmc.discourse.group/u/paulromano)\ **Post date:** [January 17, 2024, 6:53pm UTC](https://openmc.discourse.group/t/huge-text-node-in-model-settings-xml-file-error/3835/3 "2024-01-17T18:53:54Z")
Sorry @Edgar for the problem you’ve experienced here, and sorry to @yrrepy your PR didn’t receive attention sooner. It has now been merged into our main `develop` branch and should cover both of the problem cases (large geometry.xml file and large settings.xml file). ---
**Author:** ![Edgar](https://avatars.discourse-cdn.com/v4/letter/e/b487fb/32.png) [@Edgar](https://openmc.discourse.group/u/Edgar)\ **Post date:** [January 17, 2024, 7:13pm UTC](https://openmc.discourse.group/t/huge-text-node-in-model-settings-xml-file-error/3835/4 "2024-01-17T19:13:08Z")
Awesome, I’ll check it out, thank you!