you would need to build or overlay another layer of text analysis to query the DCRs by content.
Not quite.. using PLC configuration, you can add extraction beans to have the LSCS deployment process map xpaths in your DCR to LSCS attributes at deployment time, without ever writing them as EAs on the TeamSite copy.
Is this documented? Where? The beans you speak of, is this adding items to a configuration file or are you talking about writing code?