# CzmlDataSource EntityCollection Entity meta data

**URL:** <https://community.cesium.com/t/czmldatasource-entitycollection-entity-meta-data/1784>\
**Category:** CesiumJS\
**Created:** [December 18, 2014, 7:31pm UTC](https://community.cesium.com/t/czmldatasource-entitycollection-entity-meta-data/1784 "2014-12-18T19:31:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![thomlep](https://avatars.discourse-cdn.com/v4/letter/t/43a26b/32.png) [@thomlep](https://community.cesium.com/u/thomlep)\
**Post date:** [December 18, 2014, 7:31pm UTC](https://community.cesium.com/t/czmldatasource-entitycollection-entity-meta-data/1784/1 "2014-12-18T19:31:49Z")

</div>

Hello,

Please excuse me, this might be a javascript question.  
I'm loading some CZML that looks like this at the header:

[  
&nbsp;&nbsp;{  
&nbsp;&nbsp;&nbsp;&nbsp;"id":"document",  
&nbsp;&nbsp;"name":"Vehicle",  
&nbsp;&nbsp;&nbsp;&nbsp;"version":"1.0",  
&nbsp;&nbsp;"\_comment":"foo"  
&nbsp;&nbsp;}  
...  
...  
...  
]

When this is loaded I can listen for the event and say:  
alert( arg2.name );  
and pop-up the name "Vehicle" successfully.

arg2 is instance of Cesium.CzmlDataSource .

Is there a way to read the \_comment attribute? We need a flexible way to put meta data into the CZML and process against it at runtime.

(sorry, not a JS programmer, but learning).

Thanks  
-Tom