You can use any tags that you want to delimit text in your document. Just be sure that they do not occur as non-delimiters someplace else in the document.

Start tag End tag From encoding To encoding Comment
* SLP1 Devanagari Unicode Any text that is not within tags is assumed to be encoded in SLP1 and should be transcoded to Devanagari Unicode
{{kh}} {{/kh}} Kyoto-Harvard Roman Unicode Any text between {{kh}} and {{/kh}} tags is assumed to be encoded in Kyoto-Harvard and will be transcoded to Roman Unicode.
<tel> </tel> SLP1 Telugu Unicode Any text between <tel> and </tel> tags is assumed to be encoded in SLP1 and will be transcoded to Telugu Unicode.
<eng> </eng> Anything Leave as is Any text between <eng> and </eng> tags is passed through as is and the tags are removed.

Applying these transcoding rules to the following text

kfzRa {{kh}}kRSNa{{/kh}} uvAca <tel>kfzRa</tel> rAma <eng>Leave as is</eng>

will create this text

कृष्ण kṛṣṇa उवाच కృష్ణ राम Leave as is