Block library functions provides functions for processing of blocks and attributes.
Function Name	Description
BL_CheckIfSame	Checks two block inserts to see if they are the same
BL_FindAttr	Find the attrribute in a block given the tag value
BL_FindAttrNo	Find the attribute in a block given the position
BL_GetAllBlks	Find out the names of the 'normal' blocks in the drawing.
BL_GetAllBlksWithAttributes	Find out the names of the 'normal' blocks with attributes in the current drawing document
BL_GetAllXrefs	Find out the names of the currently Xref'ed drawing
BL_GetAttrLyr	Get the layer from a block attribute
BL_GetAttrHgt	Get the height of a block attribute
BL_GetAttrRotAng	Get the rotation angle of the block attribute
BL_GetAtts	Get the values of the attributes and their flags in a BLOCK INSERT entity
BL_GetBlkDef	Returns the complete block definition list from the symbol table
BL_GetNumAtts	Get the number of attributes in a BLOCK INSERT entity
BL_GetTagNames	Get the names of the tags (and flag values) belonging to a block.
BL_GetTmpBlk	Return the name of a unused temporary block
BL_IsNested?	Check whether the block is nested or not (i.e if it contains atleast one INSERT object within its definition)
BL_ReadAttr	Returns the value of the attribute of a given tag
BL_ReadAttrNo	Returns the value of the attribute of a given tag
BL_RepBlk	Replace one Block with another
BL_SetAttrHgt	Set the height of a block attribute
BL_SetAttrLyr	Set the attribute layer
BL_SetAttrRotAng	Set the rotation angle of a block attribute
BL_UpdateBlkClr	Update block definition and all instances with a specified color
BL_WriteAttr	Write a value into a specified attribute in a block
BL_WriteAttrNo	Write a value into a specified attribute at a given position in a block
BLi_GetAttFromLookup	Internal Block library function Return the name of a corresponding block attribute tag from a tag lookup list.